Diode
A diode is an electronic component that lets current flow in only one direction.
What is Diode?
Alternators use diodes to rectify current. Diodes protect circuits from voltage spikes from coils and relays. LEDs are light-emitting diodes. Relay coils often have a diode across them to absorb the spike when they switch off. When replacing such a relay, use one with the same internal circuit.
How it works
A semiconductor junction conducts in one direction and blocks the other.
Why it matters for your car
A shorted diode can drain the battery. Test diodes with the diode setting on a multimeter.
Other terms
- Android Auto
- Big Brake Kit
- Boxer Engine (Flat Engine)
- Cell-to-Pack Battery Design
- Compression Test
- Departure Angle
- Door Card (Door Panel)
- Exhaust Hanger (Exhaust Mount)
- Fuel Cell Vehicle (Hydrogen Car)
- High-voltage Service Disconnect
- Iron Fallout Remover
- Leak Detection Pump (EVAP Leak Check)
- Long-term Car Storage
- Neutral Safety Switch (Inhibitor Switch)
- Nitrogen Tyre Inflation
- Shift Interlock
- Synthetic Engine Oil
- Trafficators (Semaphore Indicators)
- Transmission Cooler
- Window Switch