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Old 12-01-2014, 10:34 AM   #1
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2014 Jeep Grand Cherokee

We pull a 2014 Grand Cherokee. For expediency I have been using a set of magnetic stickon brake/tail/turn signal lights. They plug into the Coach with the 7 pin connector. The system actually works fairly well and is certainly very visible. Also eliminates any cutting into existing vehicle wiring.

Just wondering if others towing 2014 Grand Cherokee have wired for using the Jeep's tail lights. Did you spliced into the factory wiring at the tail light and use diodes to keep from back feeding to the car and also to the coach?

Or, did you use the suggested method of drilling the tail light housing for an extra, independent bulb for the tow lights?

I have heard of horror stories of vehicle wiring getting damaged by coach current and vise versa so I was reluctant to interrupt the factory wiring.

Since we use a brake buddy independent braking system I assume the GK's factory brake lights come on anyway if the brake buddy intercedes.

Between protecting the car and coach against back feed it seems like I would need diodes in every direction on the trail light circuit and the brake/turn signal circuit which gets a bit rube goldbergish..

Any input from the experts out there or should I stick with the fool proof standalone magnetic stick on lights..:-)

thanks for any input in advance.
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Old 12-01-2014, 01:31 PM   #2
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I use a TowDaddy unit on my 2012 and on my 2014. It uses the stock bulbs and wiring and there is no cutting or splicing, just plugs into the wire loom and you run a 4 wire cable from the back to the front.
2012 Monaco Knight 36 PFT
2019 Jeep Grand Cherokee Overland
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Old 12-02-2014, 01:11 PM   #3
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My installer spliced into the wiring and used diodes. Works fine.
2008 King Aire 4562, Spartan K3(GT) w/ Cummins ISX 600
2014 Jeep Grand Cherokee Overland 5.7L V8 Hemi w/ Blue Ox Aventa LX Tow Bar and baseplate, SMI Air Force One brake
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Old 12-02-2014, 06:23 PM   #4
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Originally Posted by FlyingDiver View Post
My installer spliced into the wiring and used diodes. Works fine.
Mine too on the Cherokee, I had it installed at DEMCO where they were using my vehicle to engineer a base plate for production.

I have towed it 38 times in 2014 for just over 7,000 miles
2012 Winnebago Journey 36M Cummins 360
2014 Jeep Cherokee Limited, 36 National Parks
377 Campgrounds, 1871 nights camping since 2009 and 85 K Winnebago miles
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Old 12-02-2014, 07:29 PM   #5
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I have a 2014 trailhawk (LEDs).
I cut and installed two relays for the brake/turn, and diodes for the tail.
You can't drill the housing for adding bulbs.the relays are switched by plugging in the 7 pin trailer light cable. Basically the relays switch the lights from car t o coach control.
Do I g it this way let's my brake light flash when turning AND braking at the same time.

2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.
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