Multi-Meter advice...

WyoTraveler wrote:
The trick is to move both probes not just select a common ground when trouble shooting.

Excellent! Many times I've posted connecting to a good frame ground. And I carry a 40' wire with alligator clips for that purpose.

Needed that wire only once and in that case it was a bad ground on the MH that caused the toad lights to be in "outer space".