Question about Mopar flat tow wire harness operation.

kosinar

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I have Mopar flat towing wire harness installed in my 2020 JLUR diesel and towing it with the RV. I am using ready brute tow bar that is actuating breaks in jeep by pulling jeep break pedal with a cable. I just completed my towing setup and did few towing test drives. I had my wife following me behind and recording video of break lights and behavior of the jeep. I have noticed that depending on how hard I apply breaks on my RV my jeep third break light will or will not come on. Light application of the breaks will turn only left and right break light but third light will not come on. Only heavier break application will turn all 3 break lights on. Not sure if i can assume that left and right break light will come when RV break signal is send to jeep by Mopar wire harness and third break light is turned on by jeep break pedal being pulled and actuating jeep break light circuit. I would appreciate input from someone familiar with the subject.

Towing.jpg
 

9mmkungfu

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Can you tell me what the part number is for your harness? Wondering if it's diesel-specific.
 

MoJoe

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I have the Mopar harness in my JLUR Diesel. It is not a diesel specific part number. My lights work fine but I am using a Demco Air Force One air brake system.
 

9mmkungfu

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I should have posted an update - I did figure that out. My problem with the harness was related to the Mopar instructions being wrong. Someone pointed it out in another thread and once the wires were swapped, all was well again.
 

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