Am I Supposed to See 12V at the Tail Lights?
Re our Coachmen Freedom Express 192RBS: I have a verified measurement of only 10.39V at my left rear tail light. I am producing 13.9V from my 7-pin connector on our Ridgeline at the tail light term...
Forum Discussion
You basically did the right measurement and found the problem indirectly. When you measured the voltage across the light bulb filament itself, if your grounds were good, you would see the entire voltage dropped across one filament. When you read 10.4, that means the remaining voltage in the circuit is out there somewhere... and it is in the heavy brake/turn filament as I said. Measure the voltage across the brake turn filament. You will see it is half of the remaining voltage (13.6 - 10.4 = 3.2 1.6 on the brake/turn filament in that bulb, and 1.6 across the brake/turn filament on the other side of the vehicle.
