Calgary Jeep Association

4x4 Related Groups => Tech Talk => Topic started by: specialk on May 27, 2013, 10:37:11 AM

Title: Wiring tail lights question
Post by: specialk on May 27, 2013, 10:37:11 AM

I know we all love wiring...  and want to know if there are any other thoughts on the issue I'm having...

So I'm wiring up the tail lights on the MJ.  The engine harness is from a 95 XJ which is a 5 wire going to the MJ's 4 wire system.  I got a trailer harness to go from 5 to 4 wire.   That way the turn signals and brake lights will be figured out by the module in the harness.   White is ground.  Brown is park lights.  Yellow and green do brake/signal.  And I'm splicing all this into the harness.

i know the lights work cause if I hook them up directly, things light up.   But I need the module to help when brakes and signal are being used.

I hooked things up and I get park lights, but nothing for brake/TS.   I have power up to the harness, but nothing coming out of the green/yellow wires.

I'm thinking a bad trailer module but it was a brand new one....

Any thoughts....  besides that wiring sucks  >:(

Title: Re: Wiring tail lights question
Post by: specialk on May 27, 2013, 10:42:39 AM

I should have mentioned that Rev is not in the equation.  That is a separate wire going to it's own lights

Title: Re: Wiring tail lights question
Post by: Bnine on May 27, 2013, 11:08:19 AM

Brake and signal an 1157 on the same circut or are they seperate?

Title: Re: Re: Wiring tail lights question
Post by: binare on May 27, 2013, 11:21:24 AM

Is there a wiring diagram on the module? What end of town are in Kevin?

Title: Re: Wiring tail lights question
Post by: specialk on May 27, 2013, 11:47:01 AM

They are on the same circuit.  park lights use the low intensity filament.  Brake/TS us the other.  

And no diagram... of course not...  people only plug and play this shiet lol... It's a just a little black box.

There are 2 bulbs on each side for brakes and TS.  My plan B is to wire the top bulb to the brake and second bulb to the TS directly on the brighter filament which would work for the truck, but would not solve the issue if I ever want to hook up a trailer.

I'm in the upper SW...  just off Hwy 8 behind Westhills...

Title: Re: Wiring tail lights question
Post by: specialk on May 28, 2013, 08:57:18 PM

So I tried a new module, different manufacturer.  Same results.  Park lights work but nothing through the turn signals or brake.

I have attached a wiring diagram I found online....

Title: Re: Re: Wiring tail lights question
Post by: binare on May 28, 2013, 10:47:26 PM

Have you tried metering between the pins?

Title: Re: Wiring tail lights question
Post by: jkrubi on May 29, 2013, 11:30:31 AM

Every time I've had issues with those 5 to 4, it's been the ground wire for me!  I think I have a good ground but somehow I don't. Try running for a quick test a jumper from the battery down to it.

Title: Re: Wiring tail lights question
Post by: LLYJ on May 30, 2013, 12:17:19 AM

My neighbour got 3 bad modules straight outa the box  - couldn't believe it but it happens - each one was a friggin 2 hour drive to Canmore and back...


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