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backup lights and brake lights coming on together
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=76837		 Page 1 of 1
Author:  Pete M [ Mon Sep 23, 2013 10:27 pm ]
Post subject:  backup lights and brake lights coming on together
it's dark and I'm not going to poke around 'til the morning, but I figure I should ask to see if this is a known problem. as the title says, the backup and brake light are coming on together. both when the brake pedal is pushed as well as when shifting into reverse. It has the factory tow package so that's where I'll be starting the investigation tomorrow. also a taillight is out. not sure if that could be related but I'll fix that too obviously.

thoughts?
Author:  Billwill [ Tue Sep 24, 2013 5:42 am ]
Post subject:  Re: backup lights and brake lights coming on together
Pete M wrote:
it's dark and I'm not going to poke around 'til the morning, but I figure I should ask to see if this is a known problem. as the title says, the backup and brake light are coming on together. both when the brake pedal is pushed as well as when shifting into reverse. It has the factory tow package so that's where I'll be starting the investigation tomorrow. also a taillight is out. not sure if that could be related but I'll fix that too obviously.

thoughts?



Yeah I would start with the tow package first....pull the tow package relays out! You get strange problems like this if a ground goes missing in the bulb holder....try add a piece of wire from a clean chassis point direct to one of the rear bulb grounds.


Otherwise you have the two wires...backup and brake....joining together somewhere.

Also replace your tail light bulb, check for voltage there at the bulb and check the ground there as well.

You can download the Relevant Year Service Manual here..includes circuit diagrams: :)

http://www.colorado4wheel.com/manuals/Jeep/KJ
Author:  Ted15 [ Tue Sep 24, 2013 6:22 am ]
Post subject:  Re: backup lights and brake lights coming on together
Start with the bulbs before you tear it apart. I'm not sure how the circuits are run but it may be possible that there are filamants crossed in a bulb somewhere. That'll cause wierd stuff to happen too. :2cents:
Author:  Pete M [ Tue Sep 24, 2013 9:26 am ]
Post subject:  Re: backup lights and brake lights coming on together
one mystery solved. a new one has popped up. what the hell is this? mouse damage? this is the harness right behind the pass tail light housing.


Image
Author:  papaindigo [ Tue Sep 24, 2013 10:34 am ]
Post subject:  Re: backup lights and brake lights coming on together
Sure looks like rodent/squirrel damage depending on the ease of access. It's been known to happen.

Disconnect battery; splice in new wire ideally sealing with heat shrink tubing; rewrap with quality electrical tape. Should solve your problem.
Author:  Billwill [ Thu Sep 26, 2013 4:37 am ]
Post subject:  Re: backup lights and brake lights coming on together
Yep what papaindigo said^^^^

There have been several case of mice or squirrels chewing up wiring on the Jeeps or making a home inside the air filter housing...I had this happen to me!

I saw on one of the Jeep sites that apparently to be "green" Chrysler decided to use peanut oil instead of crude oil base products to make up their insulation for the wiring in the KJ.

Don't know if this is true but could explain why the little critters love chewing these wires. :)
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