how do i get 12 volts to the factory installed 7 round trailer plug with elec. brake

Asked by Nov 02, 2013 at 12:15 PM about the 2007 Dodge Ram 1500 SLT Quad Cab 4WD

Question type: Maintenance & Repair

I have no 12 volts to the back of the truck all lights and brake work fine

6 Answers

113,615

The center prong is usually the hot lead, depending on how it is connected, it may be hooked up with a relay so it won't be hot unless the engine is running.

2 people found this helpful.
4,485

the above is wrong on wire location. on a 7way connector, the center pin is reverse. as you look at the plug from the back of the truck, the terminal at the top right is the auxillary hot wire. there is a diagram on the connector cover. however, tennisshoes is correct that a factory plug will only have power when the ignition is turned on. if it is an aftermarket connector, the auxillary wire is frequently not connected, as it is not necessary for light or brake functions.

1 people found this helpful.
4,485

if the wire is not connected, you could run a wire directly from the battery to the connector. be sure to use at least 12 gauge wire and no more than a 20 amp fuse.

1 people found this helpful.
113,615

My mistake I was thinking of my system that I wired up special. Try this link: http://search.yahoo.com/search;_ylt=AvGJtUs3jwVdY_tNJvUNPeNG2v AI;_ylc=X1MDMjE0MjQ3ODk0OARfcgMyBGZyA3VoM19teV93ZWJfZ3 MEZnIyA3NhLWdwBGdwcmlkAwRuX2dwcwMxMARvcmlnaW4DbXkue WFob28uY29tBHBvcwMxBHBxc3RyAwRxdWVyeQM3IHBpbiB0cmFp bGVyIHdpcmluZyBkaWFncmFtBHNhYwMxBHNhbwMx? p=7%20pin%20trailer%20wiring%20diagram&type=1button&fr=uh3_m y_web_gs

1 people found this helpful.

thanks for all the help I found the wire to have a brake in it along the framerail

I had a defective factory 7 pin connector on bumper. Power lead was not hot.

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