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I've run across an alarming number of relays over the years with burnt contacts that would pass a cursory voltmeter check but wouldn't carry any load. And plenty of circuits where 12v or 24v was present on a DVOM but when load is applied the voltage goes away due to corrosion somewhere in the...

Just make sure it's not an LED or "digital" test light as those are basically worthless since they can't apply an actual load.

I prefer to use an incandescent test light (scope on a rope) and a power source. This proves they can carry amps not just pass continuity. Everyone that's inclined to troubleshoot and repair their own vehicle should have a test light (and a DVOM) and know the basics on how to use them. I quite...