How to Wire a Car Relay?

Answer Adding aftermarket improvements to sound systems, headlights and other electrical accessories can seriously overload the wiring in a modern car. In the effort to improve fuel mileage automakers red... Read More »

Top Q&A For: How to Wire a Car Relay

How to Wire a 12V Relay?

Most 12 volt relays operate accessories in a motor vehicle. Applying a small amount, as low as .2 amps of current to the relay coil closes contacts to feed power to an accessory that requires more ... Read More »

How to Wire a Five Terminal Relay?

Five terminal relays often control automobile audio and alarm systems. Identified as a single-pole double throw (SPDT) relay, five terminal relays use an electromagnetic coil to flip an internal sw... Read More »

How to Wire a Relay for a Radiator Fan?

When installing an auxiliary fan or simply wiring the factory fan so that the driver can manually turn the fan on and off, make sure the fan is turning in the right direction. If the fan is not tur... Read More »

How to Wire a Bosch Relay?

A Bosch relay is a wiring option used to help start a vehicle, such as a bus or truck, when the engine is hot. The relay keeps electrical current isolated from the battery and prevents it from reac... Read More »