I'm trying to figure out why the 12V charge line to the center pin of the 6 pin tow connector is dead. I did try turning on the ignition, still no voltage. I traced the wire to a tag with 310 on it. That vanished forward on the engine bay. I would expect to find a current regulator or at the very least a circuit breaker or fuse. I looked in the Prevost wiring panel next to the driver's seat, but nothing jumped out at me as being it.

Any ideas?

Thanks,