kyleag89 Posted July 9, 2011 Share Posted July 9, 2011 I followed the write-up from this topic.. http://www.comancheclub.com/forums/viewtopic.php?f=2&t=20578 My brake lights won't work and if I have the running lights on the turn signals won't work. If the running lights are off the turn signals and the brake light work as they should. What am I missing here? I'm using a standard 4 wire flat trailer plug. Link to comment Share on other sites More sharing options...
Eagle Posted July 9, 2011 Share Posted July 9, 2011 The standard, flat 4-wire connector is for trailers that use a combined, dual filament stop/tail light bulb. The four wires are: [*:1pywb8gb]Tail (leads to both sides) (brown)[*:1pywb8gb]Right turn/brake (green)[*:1pywb8gb]Left turn/brake (yellow)[*:1pywb8gb]Ground (white) Cherokees use a separate, amber turn signal, so to run a flat, 4-wire from a Cherokee you need a logic box. The MJ has the turn signals combined with the brake lights, so it's ready to go with a 4-wire connector. Ground the white wire from the connector anywhere you can get a good ground. Find which wire feeds the taillight filament on either side of the MJ, and tap the brown wire from the connector into that. You can tap the license light for this. Trace the wire from the right side turn signal filament, and tap the green wire into that. Trace the wire from the left side turn signal filament, and tap the yellow wire into that. From your description, I'm going to guess that you don't have a good ground, so the turns are trying to ground back through the taillight side of the circuit. Link to comment Share on other sites More sharing options...
kyleag89 Posted July 9, 2011 Author Share Posted July 9, 2011 Ahhh THANK YOU!! I am grounding the trailer wiring to the truck ground harness.(ground wire in the tail light harness) So I should just ground it to the truck body somewhere? That must be the problem. I was beginning to think I needed the converter box like my XJs have. Link to comment Share on other sites More sharing options...
kyleag89 Posted July 9, 2011 Author Share Posted July 9, 2011 I just hooked everything up as you described. I grounded the harness to the bed and then connected the remaining three wires to the taillight harness. I am tapping into them where they come through the back of the bed. What am I missing? Link to comment Share on other sites More sharing options...
Eagle Posted July 10, 2011 Share Posted July 10, 2011 Mystery. Just for giggles -- if you turn on just the taillights -- it's the lower brightness filament that comes on, on both sides? And withOUT the taillights on, if you operate the turns, brakes or 4-ways, it's the brighter filament that comes on? Oh ... and I'm asking you to confirm this for the truck, too, as well as on the trailer. Also, does it act funny both with and without the trailer connected to the harness? Link to comment Share on other sites More sharing options...
kyleag89 Posted July 10, 2011 Author Share Posted July 10, 2011 They are working for now. I'm not sure what I did but they started working although the bulbs in the rear tails do act a little funny. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now