no brake signal for trailer plug

[rod7515]

I just bought a 2011 ram 1500 quad truck to replace my 98 1500 single cab truck. It has the towing package so the plug is a factory one.
I towed an enclosed trailer home the other night and I didnt have any trailer brakes. Today I went out and found that there is no power to that leg of the plug. I went to my owners manual and found nothing that refers to a wiring diagram or breaker for that circuit. Im hoping someone here can help.
I check the cartridge fuse#J2 which ilisted as the electric brakes and that is good, also mini fuse # m1 15 amp is good.
I havent crawled under the truck to test any wires yet but was hoping someone here may know of a fuse or connector that is a common fix? Can anyone refer me to a wiring diagram from the factory or offer any help. It would be greatly appreciated.
Thanks Rod

 

[rod7515]

Update, for whatever reason when I moved the trailer tonite the brakes are now working. Not sure what changed but Im happy now!
Rod

 

[Loudram]

Clean your connections and check for loose or damaged wires. Spray the connectors with contact cleaner. You can find that in Home Depot or Lowe's in the electrical section. A coating of dialectic grease wouldn't hurt either as a final step.

 

[Elkman]

If the trailer is using the ball connection for the ground then that is your problem. Add a separate ground wire from the lights to the trailer connector.

 

[crash68]

If the trailer is using the ball connection for the ground then that is your problem. Add a separate ground wire from the lights to the trailer connector.

4, 5, 6 and 7 pin trailer plug for automotive when wired correctly include a ground wire.
Trailer lights also use the mounting bolts for the ground. The trailer frame should be attached to the ground wire that is in the plug, same for the tow vehicle.

 

[PaulTGarrett]

Nice Crash, +3 on the trailer connection poster!

Two things I could never figure out about the 7-way connectors... 1 - why didn't they just keep the pinouts the same? I know the trucking industry uses the round, which is an SAE configuration. Why did the RV peeps have to come up with their own connector. And 2 - Why doesn't the 7-way RV connector use the largest connector for ground, like the SAE?

If I didn't have to hook up to such an assortment of work trailers on a regular basis, I would just replace all my truck and trailer connectors with an SAE.