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Unread 06-26-2009, 08:31 PM   #1
Ledge
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2009 MK Patriot 
 
Join Date: Apr 2009
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No Brake Lights on Boat Trailer

Last week I had the local Jeep dealer install a "tow package" on my Pat. They installed the oil cooler, hitch, and wiring. We hooked up the boat to my Pat and the camper up to our Ram and headed out for a week at the lake. I was following my wife and realized the brake lights on the boat trailer did not work. The turn signals and the running lights work fine but not the Brake lights. When we got to the campground I hooked the boat up to the Ram and the lights all work fine. I found a local Jeep dealer near by and had them look at it. They said the TIPM was blown and they replaced it. BUT on the way home from the campground today we had the same problem.

The Jeep dealer "up North" tried to give me a hard time about making sure I unplugged the lights before I backed the boat into the water. I told him 1. I've never had the chance to back the boat into the water because I found the light problem the very first time I hooked it up and 2. this is not my first boat or trip to the water, I know better. Then he tried to tell me there must be a problem with the boat wiring even though it works fine with my Ram and it has been hooked up to my buddies Explorer with no issues. I just have a feeling they are trying to set me up somehow to get out of fixing this.......Has anyone had this problem or does anyone have any suggestions?

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Unread 06-27-2009, 05:57 AM   #2
Gramps
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The TIPM doesn't "blow" without a reason and since your trailer wiring appears to be OK I would suspect the harness is bad. Possibly a frayed wire that is shorting to ground or one of the 4 relays (the one for the brake lights) is bad.
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Unread 06-27-2009, 08:44 AM   #3
ChillyWillys
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I suspect that Gramps nailed it. A bad wiring harness was my first thought too.

Keep on Jeepin' !!!!

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Unread 06-27-2009, 11:40 AM   #4
Gramps
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I was thinking on this some more while working in my garden (tomatoes ). Even though the trailer wiring works OK on your Ram, your Ram has more tolerance (i.e less picky) than the MK for intermittent grounds, etc. At least look it over, even inside the light housings, just to make sure. Even a rusted terminal on a ground wire could cause a higher draw than the system allows.
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Unread 06-27-2009, 12:51 PM   #5
Ledge
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Quote:
Originally Posted by Gramps View Post
I was thinking on this some more while working in my garden (tomatoes ). Even though the trailer wiring works OK on your Ram, your Ram has more tolerance (i.e less picky) than the MK for intermittent grounds, etc. At least look it over, even inside the light housings, just to make sure. Even a rusted terminal on a ground wire could cause a higher draw than the system allows.
I was thinking that this morning too. I'll go over the harness this weekend. The boat trailer is less than a year old but maybe a wire got pinched. I'll check over the lights/sockets too. Thanks for the suggestion.
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Unread 07-02-2009, 01:16 PM   #6
biggered
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I just installed the hitch wiring and cooler and had the same issue.

The harness covers multiple years 2007-2008 and maybe 2009.

There is a wire that needed to be cut for it to work on a 2008.

It sticks out of the harness and is buried where the connectors plug in the engine compartment.

check out install guide in the link

http://www.mopar-accessories.com/en-...=3060&pc=43286

RED
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Unread 07-07-2009, 07:24 AM   #7
bdrainy
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I have solved the TIPM/Brake light problems on the patriot without a dealer.
First put a relay in the wire between the brake light and the tow hitch wiring. making sure there is a permanent live feed from the battery.
Second, disconnect the battery for 10 minutes. This resets the module but does not clear all the hidden settings
Third touch the battery leads togethor for 5/10 seconds. (this may take 2/3 attempts. This clears all the hidden settings.
Everything now works fine.
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Unread 07-13-2009, 07:21 PM   #8
Ledge
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Quote:
Originally Posted by biggered View Post
I just installed the hitch wiring and cooler and had the same issue.

The harness covers multiple years 2007-2008 and maybe 2009.

There is a wire that needed to be cut for it to work on a 2008.

It sticks out of the harness and is buried where the connectors plug in the engine compartment.

check out install guide in the link

http://www.mopar-accessories.com/en-...=3060&pc=43286

RED
Thanks for the tip! I just finally had time to check my harness and I found that wire described in the instructions....not cut...even though the instructions say to cut it if you have an '08. It does not say anything either way for an '09. Now I am wondering if it could be that simple and if it is that simple how did 2 different stealerships miss such an easy fix. (Well I know how my local dealership missed it, those guys don't care about anything but getting your cash)

I think I'll print the instructions and take them to the dealership. I'm sure that is the solution but I don't want to have to buy a new harness if by some fluke my model of '09 needs the wire intact.
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