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I installed a 6 volt relay to power fog lights years ago, according to an excellent diagram that Big Kev provided me on this site.
I religiously use a blade type battery cutoff ever time I pull back into the garage.

I have noticed a “click” when I turn the battery off or on and it’s coming from that fog light relay.

Is this something to be concerned about, will it drain the battery if not turned off?
Is the relay worn, the fog lights work as they should.

Thanks in advance for any insight. You people are the best!

I'd double check that you have the wires on the right terminals. It should only click when the relay is triggered by the fog light swtich.

If it's clicking when the switch is off. The it sounds like the trigger terminals and load terminals are swapped.

I agree with Kev. It may be noted that the purpose of the relay is twofold:

- to keep the lights brighter by lessening the length of wire
- to reduce wear on the switch or to be able to use a smaller switch.

If you used a heavy duty switch, it may work fine electrically. But should still be fixed.

Thanks Big Kev and Human for your replies. YOU WERE RIGHT! I had swapped the lighted switch last summer to use for the electric fuel pump until I could get a mechanical replacement. When I switched it back, I crossed the wire for #30 and #86. I should have used black and red wire instead of just black. Problem is resolved, no more clicking. Fog Lights work as they should.

Thanks, as always, for your excellent diagnoses!