Do I need power at pin 4 on my tow vehicle?
I think y'all think I be dumb. I know I need to plug that big black rubber thing on my trailer into my truck (what else will keep the trailer from falling off the ball ;)) This year we're going to...
Forum Discussion
I see nothing to support the comments that on a RV 7-way trailer plug that pin 4 is required for brake/signal/running lights.
It appears Pin 4 is strictly an AUX pin for charging the 12V trailer system batteries and for providing 12V power to the trailer. However, this would be critical back-up 12V power for the trailer break-away system and also as mentioned, for your refridge running on propane.
etrailer.com - Trailer Wiring Connectors
It appears Pin 4 is strictly an AUX pin for charging the 12V trailer system batteries and for providing 12V power to the trailer. However, this would be critical back-up 12V power for the trailer break-away system and also as mentioned, for your refridge running on propane.
etrailer.com - Trailer Wiring Connectors
