Truck power to trailer
One of the pins on the 7 pin connector is supposed to supply power to the trailer. Mine doesn’t seem to be working. If I measure the voltage at the battery, it does not go up at all when I connect t...
Forum Discussion
BFL13 wrote:
Good work. However, note that the full battery should read 12.7ish not connected. The truck is at 13.8. When connected the full trailer battery would be say 13.7ish (allowing for line loss).
If it only goes up by 0.2v that means it is not full.
The battery voltage went up from 13.0 to 13.2. It had been on a charger recently, so 13.0 isn’t too surprising. I’m interpreting the 13.2 to mean that there is still resistance in the 7 pin. or wires to it.
The reason I’m trying all this is to figure how much charging I get from a day of towing. The answer seems to be “not very much”, but that it depends a lot on how clean the connectors are.
