Ignition Relays, Sensors & Switches
- WVE®Ignition Relay ConnectorIgnition Relay Connector by WVE®. Replace your worn-out or faulty component with this quality replacement from WVE. This product is designed and tested to ensure the ultimate in durability and functionality. Made to meet or exceed the...Excellent replacement for your worn-out factory partDesigned to keep your vehicle running reliably mile after mile$17.50 - $24.46
- WVE®Ignition Switch RelayIgnition Switch Relay by WVE®. Replace your worn-out or faulty component with this quality replacement from WVE. This product is designed and tested to ensure the ultimate in durability and functionality. Made to meet or exceed the OEM...Excellent replacement for your worn-out factory partDesigned to keep your vehicle running reliably mile after mile$14.41
- WVE®Ignition Warning RelayIgnition Warning Relay by WVE®. Replace your worn-out or faulty component with this quality replacement from WVE. This product is designed and tested to ensure the ultimate in durability and functionality. Made to meet or exceed the OEM...Excellent replacement for your worn-out factory partDesigned to keep your vehicle running reliably mile after mile$47.98 - $53.67
- Cardone Reman®Diesel Glow Plug ControllerDiesel Glow Plug Controller by Cardone Reman®. Cardone Reman Remanufactured Diesel Glow Plug Controllers are remanufactured in the U.S.A and are functionally tested to recreate true on car performance. Once disassembled, all broken wire...Critical electrical component materials are upgraded to improve unit longevityInternal wire bonding process is improved to eliminate the original cause of failure$92.13
- Genuine®Diesel Glow Plug Control RelayDiesel Glow Plug Control Relay by Genuine®. If your engine ignition parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store....Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$165.76
- Genuine®Diesel Glow Plug Wiring HarnessDiesel Glow Plug Wiring Harness by Genuine®. If your engine ignition parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$152.84 - $174.68
- Genuine®Ignition IgniterIgnition Igniter by Genuine®. If your engine ignition parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store. On CarID...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$213.88 - $467.69
- Genuine®Ignition Ionic Current Control UnitIgnition Ionic Current Control Unit by Genuine®. If your engine ignition parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$539.65
- Genuine®Ignition Knock Sensor BoltIgnition Knock Sensor Bolt by Genuine®. If your engine ignition parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store. On...Genuine OE replacement parts from the OE manufacturerThe same parts your car was made with$6.05
- Genuine®Ignition ModuleIgnition Module by Genuine®. If your engine ignition parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store. On CARiD you'll...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$260.84 - $310.87
- Genuine®Ignition RelayIgnition Relay by Genuine®. If your engine ignition parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store. On CarID you'll...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$85.84 - $141.03
- Genuine®Ignition Relay Plug ConnectorIgnition Relay Plug Connector by Genuine®. If your engine ignition parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store....Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$79.13
- Genuine®Impulse SenderImpulse Sender by Genuine®. If your engine ignition parts are in need of repair, don’t compromise the performance and safety of your car with suspect, off-brand replacement parts from the local auto parts chain store. On CarID you'll...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$34.19
- Delphi®Diesel Glow Plug Wiring HarnessDiesel Glow Plug Wiring Harness by Delphi®. Latest design with a longer stabilized temperature resulting in smoother cold running. Terminals and bullet connectors are treated to resist corrosion assuring reliable connections.Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$133.22
- Mopar®Glow Plug Control ModuleGlow Plug Control Module by Mopar®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$24.90 - $289.88
- Mopar®Ignition Control ModuleIgnition Control Module by Mopar®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$54.14 - $963.44
- Mopar®Ignition Control Module BracketIgnition Control Module Bracket by Mopar®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$6.95 - $41.24
- Mopar®Ignition Immobilizer ModuleIgnition Immobilizer Module by Mopar®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$29.41 - $345.80
- Mopar®Ignition Knock Detonation Sensor BoltIgnition Knock Detonation Sensor Bolt by Mopar®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$0.59 - $12.10
- Mopar®Wireless Ignition ReceiverWireless Ignition Receiver by Mopar®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$286.28 - $526.36
- SKP®Diesel Glow Plug Wiring HarnessDiesel Glow Plug Wiring Harness by SKP®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$33.58 - $53.62
- SKP®Ignition Control ModuleIgnition Control Module by SKP®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$32.64 - $46.17
- SKP®Ignition Knock Sensor ConnectorIgnition Knock Sensor Connector by SKP®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$9.65 - $26.43
- Walker Products®Ignition Misfire SensorIgnition Misfire Sensor by Walker Products®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$41.03 - $58.25
- DIY Solutions®Diesel Glow Plug ConnectorDiesel Glow Plug Connector by DIY Solutions®. If you're seeking to get your steel stallion back to its tip-top condition, then this top-notch replacement solution is what you should definitely look out for. When it comes to quality,...Designed to help restore your vehicle to its former gloryQuick replacement to let you enjoy an awesome ride again$45.85 - $46.87
- SMP®Diesel Glow Plug RelayDiesel Glow Plug Relay by SMP®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the same or even...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$57.05 - $188.86
- SMP®Diesel Glow Plug Wiring HarnessDiesel Glow Plug Wiring Harness by SMP®. If you want to restore the original performance of your vehicle's ignition system, this product is what you need. Engineered to stringent OE specifications, it is sure to fit and function the...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$59.08 - $80.48
- Original Engine Management®Ignition Control ModuleIgnition Control Module by Original Engine Management®. Original Engine Management modules are manufactured to O.E. specification. Each unit is carefully tested to ensure proper fit and function. Some of the features and benefits of...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$23.04 - $157.85
- Original Engine Management®Ignition SwitchIgnition Switch by Original Engine Management®. OEM offers the highest quality parts available. With vehicle systems becoming more and more complex, electronic components and sensors must be manufactured to precise tolerances as not to...Manufactured to restore your vehicle’s ignition systemDesigned with your specific vehicle in mind$13.33 - $97.38
- United Motor Products®Ignition Control ModuleIgnition Control Module by United Motor Products®. Keep your pride and joy operating as it should with this top-notch part from United Motors Products. It’s made using the finest materials and advanced manufacturing equipment to...Excellent replacement for your worn out factory partWill help make your vehicle running as good as new$35.51 - $139.79
While spark plugs, ignition coils and distributors are the recognizable “stars” of the ignition system, there would be no combustion and an engine wouldn’t run without the unseen and less glamorous utility players in the system – the relays, sensors, switches, and control units. These important components execute critical functions like safely conducting high levels of current, supplying essential data to ignition modules and engine control computers, and executing commands based on those inputs for accurate spark delivery. The electronic components in contemporary ignition systems generate higher voltage and more precise ignition timing than their mechanical forebears, which provides a more powerful spark for complete combustion and better performance, greater fuel economy and lower emissions. Modern ignition parts are also more reliable as well, but they too eventually wear out and fail, and when you have need of replacements, you’ll find them right here on our digital shelves.
The ignition switch is connected to battery voltage. When the key is turned or the start button is activated, power is routed to the ignition relay. A relay allows low current and lighter gauge wire to control the high current needed to supply the ignition coil, avoiding the danger and complexity of routing high current carrying, heavy gauge wire to the ignition switch. Inside the relay is a control circuit and a power circuit. When power is sent to the relay, current is applied to the relay coil, creating a magnetic field that closes the power circuit contacts and sends voltage to the ignition coil. If the ignition relay is faulty no power will be supplied to the ignition and the engine won’t start. When a properly functioning relay is energized, the closing of the internal switch contacts can be heard or felt by hand. Voltage and resistance checks with a DVOM (Digital Volt Ohm Meter) can also be performed to determine whether the relay or relay wiring is at fault.
When power is supplied to the ignition coil, the current flowing through the coil’s primary windings creates a magnetic field. When that current flow is interrupted the collapsing magnetic field produces an electric current in the secondary windings, which is stepped up to the 15,000 – 40,000 volts needed to jump the gap between the spark plug electrodes and ignite the air/fuel mixture in the cylinders. On distributor ignitions, current flow is interrupted by a triggering mechanism in the distributor – mechanical breaker points on older distributors and magnetic pickup coils or hall effect switches on electronic ignition distributors. There is a trigger wheel called a reluctor on the distributor shaft and as the shaft rotates and the reluctor passes the pickup coil or hall effect switch, a signal is sent to an ignition module, which contains a transistor that closes and opens the primary circuit to create and collapse the magnetic field and produce the voltage sent to the spark plugs.
Electronic distributor ignition offered several advantages over its mechanical predecessor: there were no breaker points to wear, the transistor in the module could open and close the primary circuit much faster, and higher voltage could be carried, resulting in more voltage to the spark plugs and more efficient engine operation. Nevertheless, although more reliable, electronic components are still subject to failure. If the vehicle won’t start and there is no spark at the ignition coil when checked with a spark tester, turn the ignition on and check for voltage at the positive terminal of the ignition coil. If voltage is present, connect a test light between the negative coil terminal and ground. The test light should flicker when the engine is cranked. If the light doesn’t flicker, the ignition module, pickup coil or hall effect switch, or circuit wiring is faulty. The pickup coil and hall effect switch can be tested with a DVOM. Some electronic systems are affected by the gap between the pickup coil and reluctor, which can be adversely affected by distributor bushing wear and excessive play between the distributor shaft and housing. If the gap dimension is incorrect the engine may misfire or fail to start.
The ignition coils in distributorless ignition systems have their primary circuits switched on and off by an ignition module or engine control computer based on the signal from the Crankshaft Position (CKP) sensor. This signal indicates the position and speed of the crankshaft for the greatest ignition accuracy, eliminating imprecise timing that can be caused by timing chain, distributor drive gear and distributor wear and play. There are 2-wire permanent magnet and 3-wire hall effect sensors and the sensor may be mounted on the timing cover, or at the side or rear of the engine depending on whether the reluctor is mounted on the crankshaft damper, the crankshaft itself or the flywheel/flexplate. If the vehicle won’t start, runs rough, stalls, and has poor acceleration and fuel economy, the CKP sensor may be faulty. A defective CKP sensor may set a fault code and illuminate the CHECK ENGINE light. Both sensor types can be tested with a DVOM, and a scan tool connected to the vehicle’s diagnostic port will reveal fault code(s). Some engines also employ a Camshaft Position (CMP) sensor, which functions in a similar manner, for ignition timing purposes.
On electronic ignition systems primary circuit on/off control is by an ignition module, sometimes called an igniter, and/or the engine control computer. That was the sole task of the modules used with early electronic distributors, where initial timing was manually set using an inductive timing light, and ignition advance was determined by centrifugal and vacuum advance mechanisms. However, on distributorless ignition systems timing is not adjustable, and both initial timing and advance are computer controlled based on internal programming and inputs from sensors indicating engine speed, engine load, throttle position, and engine coolant temperature. A knock sensor is also employed to detect spark knock and signal the computer to retard timing. If an ignition module fails, the engine won’t start; troubleshooting is described above. If there is a problem with an engine control computer or with one of the sensors, actuators, or circuits in the engine control system, the CHECK ENGINE light should illuminate. A scan tool connected to the vehicle’s diagnostic port can be used to find trouble codes.
No matter what vehicle you’re working on or the type of ignition system, we have the replacement relays, sensors, switches and control units needed to restore proper performance, reliability and fuel economy. We offer components that are manufactured to original equipment specifications, so when repairs are completed you can count on the performance your vehicle was designed to deliver. In addition to the components described above, we also offer parts that are often needed to achieve a complete repair including harnesses, connectors, mounting brackets, and more.