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Old 05-31-2019, 09:05 AM   #1
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Tow turn signal not working

When not hooked up motor home and Jeep turn signal on left side work properly. When connected the Jeep left turn signal and brake light on left side donít work on Jeep. Please advice on trouble shooting this. Thanks
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Old 05-31-2019, 09:17 AM   #2
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bevo7-

The first place I'd start is at the coach hitch connector. If the signals check out there, I'd plug in the umbilical and check the signals at the toad end of the umbilical. If they are OK, then the problem is in the Jeep wiring (most likely).
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Old 05-31-2019, 09:31 AM   #3
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If you find you have voltage output at the umbilical cord, it would also help diagnose if you could advise the type of wiring harness in the Jeep; Mopar, Cooltech, Hopkins, etc. The Mopar uses relays to isolate the Jeep from the motor home wiring and the others use diodes.
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Old 05-31-2019, 10:55 AM   #4
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The umbilical is a Demco
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Old 05-31-2019, 04:15 PM   #5
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bevo7,
You've been given some good advice to get you going. I don't know if you know it or not but, bad grounds are the root cause of many, many auto electrical issues. Your Jeeps tail lights may work just fine by themselves. But, being supplied by signals from the coach, may put a bit more load on the grounding of the troublesome lights. This is just a guess here. As has been asked, who's harness are you using in the Jeep for towing/lights?
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Old 05-31-2019, 05:00 PM   #6
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Had a similar problem, when I slid the head back of the part of the umbilical cord that plugged into the toad, three screws fell out....that had been securing the wires to the plug.
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Old 05-31-2019, 05:11 PM   #7
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The connector point at the jeep is fairly susceptible to the pins (on the male end) getting bent or out of alignment. It's a pretty simple check before going too deep.

At least that was the problem with my new blue ox setup on my jeep first trip out!
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Old 06-03-2019, 01:05 PM   #8
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Thanks everyone. Broken wire at Jeep connector. Easy fix
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