How to Check Relays on Automobiles?
To check relays on automobiles you can use an ohm-meter to check for voltage in the circuit. Additional testing would include providing B+ to pin1 and a ground to pin3, hearing a click means the switch has closed but does not mean the relay is good. Leaving the B+ to pin1 and ground to pin3, add B+ to pin2. This makes the test light go on. Remove the B+ (circuit) to pin1 and the light on pin4 should go off. If it does not, you have a bad relay. A voltmeter can also be used by attaching to a relay to see the voltage output. You can find more information at http://www.autoshop101.com/…
