How Do You Test An Automotive Relay?
Automotive relays are used to control any accessory that draws more than 30 amps of current, including power windows, lights, fog lights, air conditioner, fog horns, heated windows and many other accessories. When an accessory doesn’t work, perhaps the relay failed. The easiest way to test it is to replace it with a known good one. If you don’t have a spare or don’t want to buy one just to find out, you can test it, but you will have to know how to use a multimeter. Remove the relay from its socket. Connect one end of one of the test lead to the positive terminal of the relay coil. Connect the one end of the other test lead to the negative terminal of the relay coil. Connect the positive lead to the positive terminal of your car battery. Connect the negative lead to the negative terminal of your car battery. You should hear a click as the relay energizes. If it does not click, the coil is bad and the relay needs to be replaced. If it does click, proceed to step 6. With your multimeter
