Cummins Diesel Forum banner

Wiring questions - Aux and/or 12v

1071 Views 9 Replies 4 Participants Last post by  DL1221
Hi all,
I've got a quick question. I have a 98 12v which has a 7-way in the bed and a 7-way on the factory hitch. All the lights work great, as does the trailer brakes plug (#2). i have no power to the 12v pin (#4) or to the center aux pin.

I am going to be towing my friends travel camper which has 12v battery power for lots of the interior lights. does the trailer charge through the #2 pin, or should I have power to #4 or the center? looking at the wires going in I have the flat 4 plus a thick Black, blue, yellow, and white wire... White I guess is a heavier ground, and i dont know about the rest... just want to make sure we are good to go as its winter and we are heading to canada with the trailer. thanks
See less See more
1 - 4 of 10 Posts
So I'm told, but when I don't get power on either of them where do I start?

And the 40 AMP fuse under the hood is good - the one marked Trailer Wiring.
Is there any chance power wouldn't be sent unless the truck was running? I've tried it with the truck in "on" but without the motor running... At a loss...
Odd that the diagrams are different, but yes my #4 has power! So I'm guessing the #2 pin only has power when the brakes are applied?

Perhaps my truck is working just fine - that would be cool!
Sounds good. I've got a controller already installed.

1 - 4 of 10 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.