How to Check Relays on Automobiles

by Bob Ricewasser; Updated September 18, 2017

In order to check relays on cars, take out a good relay and replace it to see if the problem still exists. Learn about proving that a relay is defective before trying to replace it with help from an automotive technology professor in this free video on automobile relays.

About the Author

Bob Ricewasser is a former automotive technology professor, and an avid car collector.

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