Join Date: May 2011
Location: On the road, USA
Feedback: 2 reviews
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.
2011 Unlimited Rubicon
Currently: Henderson, CO