Trailer light wiring harness install - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 14 (permalink) Old 03-21-2009, 10:20 PM Thread Starter
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Trailer light wiring harness install

Few questions....

I installed the harness, haven't went to dealership yet for programming.

I put the plug from my trailer and the running lights come on but no turn signals or brake lights. Is this the part that the programing turns on?

Thanks, just want to make sure I need to get it turned on cause the dealer wants $50.
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post #2 of 14 (permalink) Old 03-21-2009, 11:11 PM
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I didn't have to have any programming done at the stealership.The place that I bought my trailer did the wiring for me. The one thing I found out is there is no wiring harness to plug into for electric brakes. They had to run a new wire from the back to the brake controller.
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post #3 of 14 (permalink) Old 03-22-2009, 02:48 PM Thread Starter
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I bought the factory harness and installed it. I had to install the relays but the fuse was already installed and I thought that was kinda odd. The lights come on just no turn or brake lights on the trailer. I'll take it in, I'm sure it needs turned on in the computer.
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post #4 of 14 (permalink) Old 03-22-2009, 08:55 PM
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I think you are correct, I do believe the dealer has to tell the computer that the harness is there.



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post #5 of 14 (permalink) Old 03-31-2009, 11:44 AM
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So, even if I have the tow package. I still have to buy a wiring harness for my boat trailer in order for the brake & turn lights to work? And then get it programmed by the dealer?
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post #6 of 14 (permalink) Old 03-31-2009, 01:17 PM
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Quote:
Originally Posted by GeneralVue'sCommando View Post
So, even if I have the tow package. I still have to buy a wiring harness for my boat trailer in order for the brake & turn lights to work? And then get it programmed by the dealer?
I don't think so. I think the tow package includes the wiring. Do you have a seven-way plug in the rear near the trailer tow receiver?

Last edited by GPintheMitten; 03-31-2009 at 02:06 PM.
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post #7 of 14 (permalink) Old 04-01-2009, 07:49 AM
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I don't think so. I think the tow package includes the wiring. Do you have a seven-way plug in the rear near the trailer tow receiver?
Come to think of it, I haven't even checked yet. All that is visible the to eye is the circle connector which I think is the elec. brakes right? I'll check and see...Would it be on the hitch receiver or under?
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post #8 of 14 (permalink) Old 04-01-2009, 09:45 AM
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The 4 way connector is taped to the trailer harness on the back side of the bumper.
I just plug a 4 pin/7 pin adaptor into the port cause I don't feel like pulling it down.

Rob
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post #9 of 14 (permalink) Old 04-01-2009, 10:38 AM
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The 4 way connector is taped to the trailer harness on the back side of the bumper.
I just plug a 4 pin/7 pin adaptor into the port cause I don't feel like pulling it down.

Rob
Ahhhh....Okay, I'll have to check later. Thanks.
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post #10 of 14 (permalink) Old 04-01-2009, 12:02 PM
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Come to think of it, I haven't even checked yet. All that is visible the to eye is the circle connector which I think is the elec. brakes right? I'll check and see...Would it be on the hitch receiver or under?
The "circle connector" is for the trailer lights. The tow package comes with two types of connectors for the lights--the 7-pin round connector and the four pin flat connector. As robby said the four pin connector is hidden up behind the bumper. You also should have a seven pin to four pin adapter that comes with the tow package.

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Last edited by jeep5253; 04-01-2009 at 12:21 PM.
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