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What's the purpose of this blue wire?

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tomasinator

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Discussion starter · #1 ·
I bought 2013 Rubicon Unlimited a month ago. Under the hood zip-tied to the firewall is a blue wire with no connector. The end of the wire is simply cut. What's the intended purpose of the wire? I searched this forum and looked in the manual but couldn't find anything.

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Thanks, Tom
 
#6 ·
Aftermarket alarm or radio or something? I can't tell what it is connected to.
 
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Discussion starter · #11 ·
I will investigate where the blue wire (and red wire) goes when I get home tonight. The Jeep was brand new, however, I had the dealer add a trailer hitch between the time I test drove and purchased the vehicle and then picked it up a few hours later.
 
#12 ·
now that makes since. is it a 7 pin? if so the blue wire should actually be connected to your brake pedal switch for the trailer brakes if you have a brake controller and the red wire is to the plug to charge the battery on the trailer when its connected to the tow vehicle.
 
#13 ·
That's def. Aftermarket.

Anything from the Trailer shouldn't have needed to be Ran to the Engine Compartment, unless you got a 7-Pin Trailer Harness that Incorporates Trailer Brakes. Then they could have had to Run Wires to the Front for that.

But if it's just a Standard 4-Pin Harness, everything Plugs into the Rear Tail Lamps.
 
#17 ·
tomasinator said:
That's it! The trailer installation has the 7-pin connector. I would have been happy with the standard 4-pin connector.
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Follow the wires from the back of your 7 pin. I have haunch that you will find a 4 pin connector. Probably tucked up between bumper and the frame cross member The four pin would then lead to the left tail light. That is where a T-connector ties into the lights
 
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