Harley system relay bench test 

Thank you James, another exellent tutorial.

If the relay is working properly , why do we care about testing the diode?

This test is not reliable 100%. I tested both of my relays using these methods. Both relays tested fine. I went insane troubleshooting. Someone else said change that relay! I said it’s a new relay and it tested okay. I bought 2 new relays and the bike runs. Sometimes everything can test okay but still have issues. Stupid electrical problems.