Tow Wiring Dilemma?? -
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post #1 of 4 Old 04-19-2014, 06:15 PM Thread Starter
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Join Date: Apr 2014
Location: Somerset
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Tow Wiring Dilemma??

ok, so I have a 2004 Wrangler (one of the Willys edition, but that doesnt matter) and I was going to buy a camper to pull. Nothing too big, 2000lbs with electric brakes. So I looked at my harness, which is the 4 pin, then I looked closely at the wiring colors, there was a blue wire folder back into the wiring tube. So I pulled it out and hooked a volt meter to see what would happen when I hit the brakes. Lo and behold there was some voltage when the brakes were pressed. But my questions to you guys is, Is this really a good use for electric brake control? I traced the blue wire back to the rear signal light and the blue wire was connected to a pair of violet (or purple) wires. Another question would be is this factory or aftermarket? where do the violet wires go back to?

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post #2 of 4 Old 04-19-2014, 06:39 PM
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1998 TJ Wrangler 
Join Date: Jan 2012
Location: Piqua
Posts: 19
Not sure where that wire came from but most likely not for electric brake control. The electric brake controls I have installed require a heavy unswitched power source usually from the battery with its own circuit breaker and a brake power wire of 10 or 12 gauge back to the trailer harness socket. There are additional wires from the controller to the brake light system. You need a brake control to vary the power applied to the trailer brakes according to the stopping forces needed. The controller will usually have some sort of matching control to set the controller to match the trailer brakes. A brake control should have decent wiring and set up instructions. Been awhile since I got mine for my truck, think it came from NAPA.
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post #3 of 4 Old 04-19-2014, 10:13 PM
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2002 TJ Wrangler 
Join Date: Jun 2007
Location: Denton County, TX
Posts: 8,020
Google "7 pin trailer wiring". There a separate power wire and a brake wire.

And like said above you will need a brake controller. This is a small control box that mounts under the steering column, that controls the trailer brake force.

denton county, tx
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post #4 of 4 Old 04-19-2014, 11:00 PM
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2004 TJ Wrangler 
Join Date: Nov 2013
Location: San Antonio
Posts: 1,393
As said before, you need a 7 pin with brake controller to properly operate the brakes. Four pin is just for lights.
There are two different types of controllers. I have the proportional type not on my Jeep but on another vehicle with the seven pin plug. You need to circuit breaker both constant hot and brake circuits separately.

Take a look at this...
geroux is offline  

blue , harness , tow , wire , wiring

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