Hi Jim
I think you can do a quick test to see if the problem comes from the relay.
Switch on ALL lights but without turning the engine on (this will set a lower battery voltage to the relay), check if the faulty light is on. Then turn the engine on (set a higher voltage) and check the light again.
If the light is off when the engine is not running and on (or sometime on) when the engine is running, it is almost certain that the relay is faulty.
If the light is on in both cases, it may be something esle like bad contacts etc.
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