Posts Tagged: test a relay.

How to test a relay

Test a relay on your vehicle Is the relay bad? Know this before you test a relay If you’re going to do auto diagnostic work, you must know how to test a relay. Automotive relays are used extensively in cars and trucks. They use a low amperage current to switch a high amperage load. Using relays allows car makers to cut down on wiring and that cuts down on cost and vehicle weight. It’s easy to test a relay using just an ordinary digital voltmeter. Buy one at any auto … Read More