HOV

I looked on the cover of the 7-pin receptacle on my truck, and it did not show anything for trailer power supply. Does anyone know if the power line to recharge trailer batteries is already hooked up stock, or do I have to do that?

Short of hooking up a multimeter to my RV batteries, I can't tell if they're being charged when the umbilical is connected. I do have a multimeter, but it's a 70-mile trip to go visit my RV storage location.

Red1ton

My 04 3500 has the charge wire already put into the plug...factory done !!

HOV

Mine should have it also then.

Does yours have a fuse somewhere? After I posted this I searched some more and read that the power line is not fused for some reason.

carcrz

It's labeled as + & -