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Old 08-30-2009, 02:53 PM   #1
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Wiring for flat towing my TJ

I am currently using magnetic towing lights when I flat tow my '04 TJ. I would like to wire up the Jeep with a perminent wire harness and plug up front that will plug into my towing rig. I can't find any info on the proper way or location to splice into the Jeep harness . I've seen Jeeps being towed behind motorhomes with this set up but it's kinda hard to get the info at 65 mph . Is there anyone out there that can help me out?

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Old 08-30-2009, 03:39 PM   #2
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Wouldn't you just be able to get a trailer wire kit and just get a Y-adapter to tap into your jeeps trailer hook up and the tow truck and the same time... That would be really simple. But maybe there is a even better way.

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Old 08-30-2009, 04:48 PM   #3
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Thanks for the reply jwm1986. Unfortunately thats what I thought but my buddy with a YJ tried that and all went well except for both turn signals lighting up whenever he turns on either side. Also the task of running wiring back up the length of the entire Jeep is a hassle, I would like to terminate under the dash if possible. I've read on other blogs about having to use diodes on both rt & lft turn circuits as to not have tow vehicle voltage run back through the Jeep dash at the termination point and fry things. Makes sense but I would like to learn more.
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Old 08-30-2009, 06:54 PM   #4
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my 99 was owned by some old folks from missouri, they would tow it behind their RV. There was a flat plug tucked into the grill, and the harness ran all the way to the back where it tied into the TJ's tail lights. It was cleanly done so I left it alone.
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Old 08-30-2009, 07:23 PM   #5
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I did this to mine....put diodes in the tail light wires just inside the rear of the jeep. I soldered mine in it was very easy. I got the diodes at radio shack. I think they were less than $10. Then run a flat trailer wire from the front to the rear where the diodes are. Wire the flat wire to the tail light side of the diode. This will prevent your tow vehicle from back feeding the jeep. (the jeep however will still feed the tow if you hit the brakes etc.) I stopped my flat cable right at the front bumper and made a short (4') jumper that I left attached to the tow bar. It made the wiring easier to hide on the jeep.
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Old 08-30-2009, 09:18 PM   #6
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Thanks ccrane2299, This is just what I've been looking for ! I will do the same type of termination but under the dash. Yours sounds like it came out clean and is the proper way to do it! The wires should be the same color code up front but I will use a meter to be sure. The diodes sound like the safe bet, I will check the Shack tomorrow . Thanks again.
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Old 08-31-2009, 08:52 AM   #7
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I tow my TJ behind my Motorhome with this set up, RV Towing Accessories - Night Shift Auto. It is easy to do, and does not interfere with the factory wiring. I have even removed it from a previous TJ, and installed it on my 2005 that I have now.
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Old 08-31-2009, 10:16 PM   #8
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Thanks for the link Rjsimms, this is an interesting alternative to going into the stock wiring. How hard was it to cut into the reflector plate and install the socket?
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Old 09-01-2009, 07:12 AM   #9
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RedRider, it was actually fairly painless. Just mark the spot, want to avoid the two bulbs touching, and use a hole saw, or a uni bit. I ran the wires from the front to the back inside the box frame on the driver’s side. It is pretty easy to fish the wires from the left to the right.
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Old 09-01-2009, 07:25 AM   #10
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I am not a big fan of diode kits. If you can install a seperate bulb in the tail light that is the way to go. I get mine at the local auto parts store. they are replacement sockets for an olds. we use those because they are very flat. drill a one inch hole in the rear of the light housing and they will snap right in. I had to go with the diode kit due to led tail lights. Please stay away from the radio-shack diodes if you are towing frequently because they do generate heat and will fail. spend the extra money and use a set from blue ox (Blue Ox Products Home Page) or roadmaster (www.roadmasterinc.com) these have heatsinks built in and will last much longer. when I installed mine I put the 4-flat trailer connector downstream of the diodes so I can tripple tow if I need to.
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Old 09-03-2009, 08:28 PM   #11
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Rob and Mrmikeypoo, thanks for the instruction and diode advise. All this will be very useful when I start this project. Wish me luck-no electrical snafu's.

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