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Old 07-19-2016, 05:41 PM   #1
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Toad Wiring

So I'm trying to get my 2011 Jeep Wrangler set up as our toad. I installed a Cool Tech wiring harness in the Jeep and was even successful in getting it snaked through the DS frame. After running down a blown fuse in the coach, I connected my Blue Ox coiled wire between the coach's 7-way and the Jeep's 4-round. Nothing! No lights at all...not even incorrect lights. As a last question before I throw in the towel...does the hitch itself need to be present? Is the Jeep picking up a ground from the coach via the hitch?

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Old 07-19-2016, 07:21 PM   #2
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It shouldn't, there should be a dedicated ground wire in a 4 pin or 7 pin connector. With a 12 v light probe, you should check that each function in the RV is present in it's connection, then check the Jeep's wiring by putting a jumper wire from the 12 v post of the Jeep's battery to each pin in the connector (except the ground!) Step by step you'll solve the problem.


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Old 07-19-2016, 08:06 PM   #3
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As Bluefin says, grab a test light and verify that all the correct signals, i.e. Lt/brake, Rt/brake, tail/marker/ etc. are all present at the trailer plug on the back of the coach. Once that's done and verified, then, plug in the Blue Ox coiled pig tail. Now, re-verify that all the signals are present and in correct position on the other end of that pig tail. Once that's done and verified, plug the pig tail into the toad and start chasing where the singles are lost.

But, also, do make sure that the ground, in the coaches trailer plug, is a good and strong ground. Then make sure that same ground it getting through the pig tail.
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Old 07-19-2016, 08:15 PM   #4
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Anything at the 4 wire plug before you plug it into the Jeep? If you disconnect from the Jeep and just put your test light in the 4 pin end while grounded to the MH, that might tell if the ground isn't carrying through to the Jeep.
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Old 07-19-2016, 08:48 PM   #5
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If nothing works and volts at the RV jack are good suspect the ground to be missing. If you have a piece of wire laying around, just jumper from a metal spot on the Jeep to a metal spot on the Motorhome.
Vince and Susan
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Old 07-19-2016, 11:28 PM   #6
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The CoolTech harness kit comes with a Pollack 4 pin connector. From pictures I have seen of the Blue Ox 7-4 coiled cable (on E-Trailer), it does not look like it uses the mating Pollack 4 pin connector. If you are using this combination, this may be your problem (the connector pins are not properly engaging).

The CoolTech harness kit comes with a trouble shooting guide. The guide recommends that you verify that the 4 wires (at the 4 pin connector end) work properly before mounting the connector. I did this using a test light with the clamp end on the ground wire, then turning the Jeep’s lights, left and right turns on one at a time and checking that there is continuity at the appropriate wire end using the probe tip on the test light. That verified that the wiring was properly installed and the CoolTeck connections at the left rear light is making proper contact. This is an easy check if you have already mounted the connector to the front of the Jeep. If all is OK here, then the problem is at the motorhome or the coiled cable.
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Old 07-21-2016, 01:11 PM   #7
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Thanks to all respondents. This has been a comedy of errors and I finally had to admit defeat and take it to someone more talent than myself. It started with a blown fuse in the coach itself which affected the right side lights of the 7-way. Then as RnG pointed out, I had to replace one end of the Blue Ox pigtail with a different 4-round to fit the Pollack receptacle of the Cool Tech harness. Bottom line...although I'm pretty handy most of the time, I SUCK at anything electric.

"A man's GOT to know his limitations." - "Dirty" Harry Callahan

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