Electrical & Gauges
10 subcategories-
Batteries602 products
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Battery Chargers266 products
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Spark Plugs1062 products
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Speedometer & Tachometer1000 products
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Gauges528 products
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Starters & Ignition3555 products
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Stators & Regulators1510 products
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Electrical & Gauges Hardware & Accessories1246 products
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Horns240 products
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Electrical & Gauges Hardware & Accessories1246 products
Electrical and instruments for your motorcycle
The electrical system keeps your motorcycle running: the charging system supplies power, the ignition lights the mixture, and the instruments tell you whether it all works. If one link in the chain breaks, the bike stops — usually a long way from home.
A motorcycle has a small charging system with a small margin. Stator, regulator and battery work closely together, and one weak link quickly puts a strain on the other two.
That is why the choice of component matters. An undersized regulator, the wrong spark plug or a set of cables with conductors that are too thin cause faults that are hard to find and expensive in time.
This guide covers how the charging system is built up, the ignition parts, instruments and wiring, how to choose according to your riding, how to spot wear in time, and what to watch out for during fitting.
The collection brings together more than 10,000 part numbers, and most of them are in stock. You will find Rick's Motorsport Electric, Cycle Electric, Drag Specialties, Namz, MCS, Zodiac, Moose Offroad, NGK Spark Plugs, Parts Unlimited, Parts Europe, V-Twin, Sumax, Dakota Digital, Accel and Dynatek.
Use Find your bike on Partsdenmark.com to filter the range down to parts that fit your exact model and year — and remember that there is free shipping on orders over €200.
The technical basics of charging system and ignition
A modern motorcycle electrical system is a 12 V direct current system in which a Stator produces alternating current, a Rectifier Regulator rectifies and limits it, and the battery acts as a buffer. The ignition draws its power from the same circuit via a Coil and a set of spark plugs.
The charging system's parts and key figures
You can measure the entire charging system with an ordinary multimeter if you know the expected values.
- Battery at rest: 12.6–12.8 V on a fully charged Agm battery; below 12.4 V it needs charging.
- Charging voltage at revs: typically 13.8–14.5 V measured across the terminals.
- Stator: supplies alternating current whose voltage rises with engine speed; the windings have very low resistance and must not have continuity to earth.
- Rectifier and Regulator: convert alternating current to direct current and dump surplus energy as heat — which is why they sit in the airflow.
- Alternator and Charging kits: rotor, Stator and regulator matched as one complete system.
Ignition, instruments and wiring
The ignition side and the instruments share the same cables, connectors and fuses, and this is often where the fault actually lies.
- Plug: spark plugs come with 10, 12 and 14 mm threads and in various heat ranges, where a higher NGK number means a colder plug.
- Electrode gap: typically 0.6–1.0 mm depending on model and ignition system.
- Coil: ignition coils are available as single and dual output as well as stick coils.
- Gauges, Dashes and Speedometer: mechanical drive via Cable or an electronic signal from a wheel or gearbox sensor.
- Switch and Cable: switches, wiring harnesses, connectors and extension kits for bar-mounted controls.
A Cover protects the stator's cable grommet and the regulator's cooling fins against stones and water — small parts that matter a lot for service life.
Choose electrical and instruments to suit your riding
The choice depends on how much current you draw and how hard the parts are worked. A commuter bike with standard lighting makes completely different demands than a tourer with auxiliary lights, heated grips and an audio system.
| Riding style | Type | Advantages | Disadvantages | Brands in the range |
|---|---|---|---|---|
| Commuting and road riding | Replacement Stator and Regulator in original specification | Direct fit, known output, simple fitting | No spare capacity for accessories | Rick's Motorsport Electric, Parts Unlimited, Parts Europe |
| Touring with a lot of accessories | High output Charging kit with Alternator and Stator | Headroom for heated grips, extra Light and audio | Considerably more expensive and often requires replacing everything at once | Cycle Electric, Rick's Motorsport Electric, Drag Specialties |
| Offroad and enduro | Rugged Coil, Plug, Switch and compact Light | Handles water, mud and vibration | Limited choice of instruments | Moose Offroad, NGK Spark Plugs, Parts Europe |
| Custom and restoration | Dashes, Gauges, Speedometer and complete Cable kits | Free choice of layout, look and cable lengths | Requires planning and often modification | Dakota Digital, Namz, Zodiac, MCS, V-Twin |
| Tuning and performance | Performance Coil, plug leads and electronic ignition control | Stronger spark, adjustable ignition advance | Places demands on battery and setup | Accel, Dynatek, Sumax |
If you mostly ride short trips in town, the battery rarely reaches full charge. Here a healthy Agm battery and a properly working Regulator matter more than extra output from the stator.
If you are building a bike, plan the wiring first. Instruments, switches and harness should be chosen as a whole, otherwise you end up with adapters and joints that later give poor connections.
Materials and variants explained
The difference between two apparently identical parts lies in materials, windings and electronics. They decide whether the part lasts one season or ten.
Stator, windings and lacquer
A Stator consists of copper wire wound around an iron core and protected by insulating lacquer. The quality and impregnation of the lacquer determines how long the winding will tolerate heat and an oil bath.
Cheap copies typically fail at the grommet or between two windings, which gives falling charging voltage at high revs. Rick's Motorsport Electric and Cycle Electric supply stators with heavy insulation for both standard and High output setups.
Spark plugs: copper, platinum and iridium
A copper plug conducts heat well and is the cheapest place to start, but the centre electrode wears faster. Platinum and iridium have thinner, more wear-resistant electrodes that keep the spark voltage stable for longer.
NGK Spark Plugs covers almost every Plug requirement from classic V-twins to modern enduro engines. Always choose the same heat range as the manufacturer specifies — the wrong heat range gives you either fouling or overheating.
Instruments: mechanical, electronic and digital
Mechanical Gauges are driven by a Cable from the front wheel or gearbox and are easy to troubleshoot. Electronic Speedometer units use a pulse signal and can be calibrated for a changed wheel size or gearing.
Digital Dashes from Dakota Digital combine speed, revs, fuel gauge and warning lights in one housing. That means fewer holes in the top yoke and simpler cable routing, but it requires the correct signal input.
Wear, service life and maintenance
Electrical parts rarely die without warning. Voltage drop, unstable instruments and a sluggish starter are early signs you can still act on.
Charging system and battery
Measure the charging voltage with the engine warm. If it is below 13.5 V at higher revs, the Stator or Rectifier Regulator is on the way out; above 15 V the regulator is boiling the battery dry.
An Agm battery typically lasts three to five seasons with correct maintenance. Using a maintenance charger over the winter extends its life noticeably.
Brown or melted connectors at the regulator are a clear sign of contact resistance and must be put right before you fit new parts.
Ignition and spark plugs
Standard spark plugs are typically changed every 10,000–20,000 km, while iridium and platinum last considerably longer. Always change all the plugs at once and check the electrode gap before fitting.
The burn pattern tells you a lot: a light grey to light brown insulator is normal, black soot points to a rich mixture, and a white, blistered insulator to a lean mixture or too hot a plug.
Starter, switches and wiring harness
A Starter that turns slowly or just clicks is most often down to poor earth connections or a tired battery — not the motor itself. Measure the voltage drop across the starter cable while cranking before you condemn the starter.
Switch units on the bars are exposed to water and vibration. If the indicators or horn cut out intermittently, the fault is usually in the switch or in the connector behind the headlight shell.
Troubleshooting and fitting in practice
Always start with the battery and earth. More than half of all electrical faults on motorcycles are caused by a weak battery or a poor earth connection, and both can be checked in a few minutes.
Disconnect the negative terminal before you work on the harness. That protects you, the instruments and any control units against short circuits during fitting.
When changing the Stator or Alternator you should check the rotor and magnets at the same time. A rotor with loose magnets will destroy the new Stator shortly after fitting.
Use crimp terminals with heat shrink rather than snap connectors, and route the cables so they do not chafe against the frame or the steering stops. Namz and MCS have extension kits and harnesses that match the original connectors, so you avoid cutting into the existing loom.
Fit spark plugs by hand first and then tighten to the manufacturer's torque. A plug tightened without a torque wrench is one of the most common causes of stripped threads in the cylinder head.
Frequently asked questions about electrical and instruments
These are the questions we get most often from customers who troubleshoot and fit electrical parts themselves.
How do I know whether it is the stator or the regulator that is faulty?
Measure the stator's AC voltage directly at the connector with the engine running; it should rise steadily with the revs and be equal between all pins. Then measure resistance to earth — if there is continuity, the stator is faulty.
If the stator's values are fine but the charging voltage at the battery is low or unstable, that points to the Rectifier Regulator or to a bad connector between the two.
Should I go for a High output charging system?
Only if your actual current draw exceeds the capacity of the original system, typically with auxiliary lights, heated clothing and an audio system. If you ride standard, a larger Charging kit gives no benefit.
Can I fit a digital instrument to an older motorcycle?
Yes, but you need a usable speed signal. If the bike only has a mechanical drive, it requires a sensor or a converter, and the rev signal has to be taken from the Coil or ignition module.
Dakota Digital units can be calibrated for both wheel size and pulse count, so the readout is correct after a rebuild.
Which spark plug fits my motorcycle?
Always use the manufacturer's recommended heat range and thread reach. Filter with Find your bike and you will get the Plug variants from NGK Spark Plugs that fit your model and year.
Why does my fuse keep blowing?
A fuse that blows again and again means a short circuit — not a fuse problem. Typical places are trapped cables at the steering lock-to-lock, at the swingarm or under the tank.
Never fit a higher-rated fuse just to get going. The wire is sized for the original rating, and an oversized fuse simply moves the damage to the cable.
If you need to go deeper into the system, you will find the power supply under batteries, while starting and ignition parts such as Starter, Coil and ignition modules are under starters and ignition. Cables, connectors and switches are gathered under wiring and switches.
All electrical parts on Partsdenmark.com are sold with 2-year right of complaint, and we offer a European price match if you find the same item cheaper at a European dealer. Use Find your bike to see exactly the parts that fit your machine — and remember free shipping on orders over €200.
Select a motorcycle to see which parts fit.
Electrical & Gauges
Electrical and instruments for your motorcycle
The electrical system keeps your motorcycle running: the charging system supplies power, the ignition lights the mixture, and the instruments tell you whether it all works. If one link in the chain breaks, the bike stops — usually a long way from home.
A motorcycle has a small charging system with a small margin. Stator, regulator and battery work closely together, and one weak link quickly puts a strain on the other two.
That is why the choice of component matters. An undersized regulator, the wrong spark plug or a set of cables with conductors that are too thin cause faults that are hard to find and expensive in time.
This guide covers how the charging system is built up, the ignition parts, instruments and wiring, how to choose according to your riding, how to spot wear in time, and what to watch out for during fitting.
The collection brings together more than 10,000 part numbers, and most of them are in stock. You will find Rick's Motorsport Electric, Cycle Electric, Drag Specialties, Namz, MCS, Zodiac, Moose Offroad, NGK Spark Plugs, Parts Unlimited, Parts Europe, V-Twin, Sumax, Dakota Digital, Accel and Dynatek.
Use Find your bike on Partsdenmark.com to filter the range down to parts that fit your exact model and year — and remember that there is free shipping on orders over €200.
The technical basics of charging system and ignition
A modern motorcycle electrical system is a 12 V direct current system in which a Stator produces alternating current, a Rectifier Regulator rectifies and limits it, and the battery acts as a buffer. The ignition draws its power from the same circuit via a Coil and a set of spark plugs.
The charging system's parts and key figures
You can measure the entire charging system with an ordinary multimeter if you know the expected values.
- Battery at rest: 12.6–12.8 V on a fully charged Agm battery; below 12.4 V it needs charging.
- Charging voltage at revs: typically 13.8–14.5 V measured across the terminals.
- Stator: supplies alternating current whose voltage rises with engine speed; the windings have very low resistance and must not have continuity to earth.
- Rectifier and Regulator: convert alternating current to direct current and dump surplus energy as heat — which is why they sit in the airflow.
- Alternator and Charging kits: rotor, Stator and regulator matched as one complete system.
Ignition, instruments and wiring
The ignition side and the instruments share the same cables, connectors and fuses, and this is often where the fault actually lies.
- Plug: spark plugs come with 10, 12 and 14 mm threads and in various heat ranges, where a higher NGK number means a colder plug.
- Electrode gap: typically 0.6–1.0 mm depending on model and ignition system.
- Coil: ignition coils are available as single and dual output as well as stick coils.
- Gauges, Dashes and Speedometer: mechanical drive via Cable or an electronic signal from a wheel or gearbox sensor.
- Switch and Cable: switches, wiring harnesses, connectors and extension kits for bar-mounted controls.
A Cover protects the stator's cable grommet and the regulator's cooling fins against stones and water — small parts that matter a lot for service life.
Choose electrical and instruments to suit your riding
The choice depends on how much current you draw and how hard the parts are worked. A commuter bike with standard lighting makes completely different demands than a tourer with auxiliary lights, heated grips and an audio system.
| Riding style | Type | Advantages | Disadvantages | Brands in the range |
|---|---|---|---|---|
| Commuting and road riding | Replacement Stator and Regulator in original specification | Direct fit, known output, simple fitting | No spare capacity for accessories | Rick's Motorsport Electric, Parts Unlimited, Parts Europe |
| Touring with a lot of accessories | High output Charging kit with Alternator and Stator | Headroom for heated grips, extra Light and audio | Considerably more expensive and often requires replacing everything at once | Cycle Electric, Rick's Motorsport Electric, Drag Specialties |
| Offroad and enduro | Rugged Coil, Plug, Switch and compact Light | Handles water, mud and vibration | Limited choice of instruments | Moose Offroad, NGK Spark Plugs, Parts Europe |
| Custom and restoration | Dashes, Gauges, Speedometer and complete Cable kits | Free choice of layout, look and cable lengths | Requires planning and often modification | Dakota Digital, Namz, Zodiac, MCS, V-Twin |
| Tuning and performance | Performance Coil, plug leads and electronic ignition control | Stronger spark, adjustable ignition advance | Places demands on battery and setup | Accel, Dynatek, Sumax |
If you mostly ride short trips in town, the battery rarely reaches full charge. Here a healthy Agm battery and a properly working Regulator matter more than extra output from the stator.
If you are building a bike, plan the wiring first. Instruments, switches and harness should be chosen as a whole, otherwise you end up with adapters and joints that later give poor connections.
Materials and variants explained
The difference between two apparently identical parts lies in materials, windings and electronics. They decide whether the part lasts one season or ten.
Stator, windings and lacquer
A Stator consists of copper wire wound around an iron core and protected by insulating lacquer. The quality and impregnation of the lacquer determines how long the winding will tolerate heat and an oil bath.
Cheap copies typically fail at the grommet or between two windings, which gives falling charging voltage at high revs. Rick's Motorsport Electric and Cycle Electric supply stators with heavy insulation for both standard and High output setups.
Spark plugs: copper, platinum and iridium
A copper plug conducts heat well and is the cheapest place to start, but the centre electrode wears faster. Platinum and iridium have thinner, more wear-resistant electrodes that keep the spark voltage stable for longer.
NGK Spark Plugs covers almost every Plug requirement from classic V-twins to modern enduro engines. Always choose the same heat range as the manufacturer specifies — the wrong heat range gives you either fouling or overheating.
Instruments: mechanical, electronic and digital
Mechanical Gauges are driven by a Cable from the front wheel or gearbox and are easy to troubleshoot. Electronic Speedometer units use a pulse signal and can be calibrated for a changed wheel size or gearing.
Digital Dashes from Dakota Digital combine speed, revs, fuel gauge and warning lights in one housing. That means fewer holes in the top yoke and simpler cable routing, but it requires the correct signal input.
Wear, service life and maintenance
Electrical parts rarely die without warning. Voltage drop, unstable instruments and a sluggish starter are early signs you can still act on.
Charging system and battery
Measure the charging voltage with the engine warm. If it is below 13.5 V at higher revs, the Stator or Rectifier Regulator is on the way out; above 15 V the regulator is boiling the battery dry.
An Agm battery typically lasts three to five seasons with correct maintenance. Using a maintenance charger over the winter extends its life noticeably.
Brown or melted connectors at the regulator are a clear sign of contact resistance and must be put right before you fit new parts.
Ignition and spark plugs
Standard spark plugs are typically changed every 10,000–20,000 km, while iridium and platinum last considerably longer. Always change all the plugs at once and check the electrode gap before fitting.
The burn pattern tells you a lot: a light grey to light brown insulator is normal, black soot points to a rich mixture, and a white, blistered insulator to a lean mixture or too hot a plug.
Starter, switches and wiring harness
A Starter that turns slowly or just clicks is most often down to poor earth connections or a tired battery — not the motor itself. Measure the voltage drop across the starter cable while cranking before you condemn the starter.
Switch units on the bars are exposed to water and vibration. If the indicators or horn cut out intermittently, the fault is usually in the switch or in the connector behind the headlight shell.
Troubleshooting and fitting in practice
Always start with the battery and earth. More than half of all electrical faults on motorcycles are caused by a weak battery or a poor earth connection, and both can be checked in a few minutes.
Disconnect the negative terminal before you work on the harness. That protects you, the instruments and any control units against short circuits during fitting.
When changing the Stator or Alternator you should check the rotor and magnets at the same time. A rotor with loose magnets will destroy the new Stator shortly after fitting.
Use crimp terminals with heat shrink rather than snap connectors, and route the cables so they do not chafe against the frame or the steering stops. Namz and MCS have extension kits and harnesses that match the original connectors, so you avoid cutting into the existing loom.
Fit spark plugs by hand first and then tighten to the manufacturer's torque. A plug tightened without a torque wrench is one of the most common causes of stripped threads in the cylinder head.
Frequently asked questions about electrical and instruments
These are the questions we get most often from customers who troubleshoot and fit electrical parts themselves.
How do I know whether it is the stator or the regulator that is faulty?
Measure the stator's AC voltage directly at the connector with the engine running; it should rise steadily with the revs and be equal between all pins. Then measure resistance to earth — if there is continuity, the stator is faulty.
If the stator's values are fine but the charging voltage at the battery is low or unstable, that points to the Rectifier Regulator or to a bad connector between the two.
Should I go for a High output charging system?
Only if your actual current draw exceeds the capacity of the original system, typically with auxiliary lights, heated clothing and an audio system. If you ride standard, a larger Charging kit gives no benefit.
Can I fit a digital instrument to an older motorcycle?
Yes, but you need a usable speed signal. If the bike only has a mechanical drive, it requires a sensor or a converter, and the rev signal has to be taken from the Coil or ignition module.
Dakota Digital units can be calibrated for both wheel size and pulse count, so the readout is correct after a rebuild.
Which spark plug fits my motorcycle?
Always use the manufacturer's recommended heat range and thread reach. Filter with Find your bike and you will get the Plug variants from NGK Spark Plugs that fit your model and year.
Why does my fuse keep blowing?
A fuse that blows again and again means a short circuit — not a fuse problem. Typical places are trapped cables at the steering lock-to-lock, at the swingarm or under the tank.
Never fit a higher-rated fuse just to get going. The wire is sized for the original rating, and an oversized fuse simply moves the damage to the cable.
If you need to go deeper into the system, you will find the power supply under batteries, while starting and ignition parts such as Starter, Coil and ignition modules are under starters and ignition. Cables, connectors and switches are gathered under wiring and switches.
All electrical parts on Partsdenmark.com are sold with 2-year right of complaint, and we offer a European price match if you find the same item cheaper at a European dealer. Use Find your bike to see exactly the parts that fit your machine — and remember free shipping on orders over €200.
