Jk flat tow electrical problem - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 8 Old 05-27-2014, 01:15 PM Thread Starter
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Jk flat tow electrical problem/ radiator fan misbehavior

I have prepared my 2007 jk for flat towing using the cooltech wire harness. all the lights, signals and stop lights work. The problem is when the lights from the towing vehicle are turned off and then turned back on the radiator cooling fan in the jeep comes on. Along with the fan being on there is a buzzing coming from the main fuse panel. The battery negative is disconnected and the ignition fuse is pulled. has anyone had this problem ? Any ideas of how to remedy this problem? Thanks

Last edited by kori; 05-28-2014 at 06:44 AM. Reason: more detail
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post #2 of 8 Old 05-28-2014, 11:17 PM
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Wow. Odd problem. I would first check the plug on the tow vehicle and make sure everything meters properly. The CoolTech harness is pretty straight forward, so there should be no connection issue there.

When I had my '08, I didn't disconnect the negative and pulled the IOD fuse so that I could use my Brake Buddy.

Really sounds like something is back feeding into the fuse box. I would first make sure the plug on the tow vehicle checks out, and make sure you have no shorts in the CoolTech harness. You can also shoot them an email - they might have an idea.

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post #3 of 8 Old 05-29-2014, 07:34 AM Thread Starter
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Thanks will double check connections. Cool tech was quick to answer emails. If I figure it out I will post solution.
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post #4 of 8 Old 05-29-2014, 09:14 PM Thread Starter
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OK, hooked battery negative back up and only pulled iod fuse. Problem solved. Thanks
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post #5 of 8 Old 05-30-2014, 09:09 AM
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Awesome - glad it worked out.

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post #6 of 8 Old 07-04-2014, 03:51 PM
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Quote:
Originally Posted by kori View Post
OK, hooked battery negative back up and only pulled iod fuse. Problem solved. Thanks
I have an 07 jk with the cooltech harness and am having a simular issues. I disconnect negative battery terminal as instructed and all lights work but harness powers up random bits of the jeep like wipers and ticking sounds from fuse box.

Did cooltech instruct you to keep negative terminal connected? I have been trying everything to fix this issue with no luck, have triple checked connectors to ensure plug config is correct with MH.
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post #7 of 8 Old 07-11-2014, 04:15 PM
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I use there harness on my 08 unlimited with great results. I leave the ground on the battery and pull the positive cable. Towed over 20,000 miles with it no problems. I won't swear there are no extra lights on inside the jeep but it does send power to the trailer plug which is great when we double tow the boat as well.


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post #8 of 8 Old 07-13-2014, 10:51 AM
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Yeah, I think I will try unhooking positive terminal first, seems to me since I am disconnecting ground and yet jeep is powering up tow rig must be providing ground when hooked up. Also issue is constant when running lights are turned on. Cooltech has sent me a couple of messages on another forum and has a few tests they would like me to try, so will give it a go in a week or so once I have the RV and jeep together and report any solutions here.
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