I have a 79 Fleetwood pace arrow with a Dodge chassis have no running or brake lights and all fuses are good brake light switch is good bulbs good don't know if the living area 12v lights have anythin...
Checking lamp sockets with a meter is useless - use a test light probe with alligator clip to ground. You may need a length of wire i.side to reach a guaranteed good chassis negative --.
Many of the older rigs had wire access only behind one tail light or another. You.have to remove the housing.
No connection whatsoever between outside tail lights and inside house lights.
But first you need to put a load on the circuit by using a light bulb. This testing problem is as old as the hills.
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