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  #1  
Old 09-06-2016, 07:25 AM
Lmbkiller Lmbkiller is offline
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Default Trailer lites

Before I tear into my problem thought I would solicit advice/comments on here, so here goes.....I have a trailer with surge brakes, reverse lites, 5 flat wire harness. Tow vehicle is equipped with the reverse override wire (hence 5 flat). When I got back from a fishing trip yesterday I noticed when I was backing up the driveway (with hazard lites engaged) that my reverse lites were flashing as well. Then, when I was almost backed into the garage, I pressed brake pedal and noticed my amber running lites would brighten up in conjunction with brake pedal position. I have some ideas on what the problem is and I'm goin with a ground issue for starters. What say u WC?
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  #2  
Old 09-06-2016, 08:20 AM
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Hot Runr Guy Hot Runr Guy is online now
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It's a ground issue, the ground wire does not have enough capacity to handle all the loads (broken/frayed/undersized) so the other circuits flash as you have described.

HRG
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  #3  
Old 09-06-2016, 10:37 AM
REW REW is offline
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Lmb,
If your current lighting system relies on the body of the trailer for ground, add a ground wire to all of your lights with a good solid ground running through your flat 5 connector to your vehicle ground.

Good luck
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  #4  
Old 09-08-2016, 05:15 AM
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Bobby Winds Bobby Winds is offline
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Quote:
Originally Posted by Hot Runr Guy View Post
It's a ground issue, the ground wire does not have enough capacity to handle all the loads (broken/frayed/undersized) so the other circuits flash as you have described.

HRG
Bingo...............HRG hit it on the head............bad grounds on 12 volt systems will drive you crazy.
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  #5  
Old 09-08-2016, 06:23 AM
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AllenW AllenW is offline
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Quote:
Originally Posted by Hot Runr Guy View Post
It's a ground issue, the ground wire does not have enough capacity to handle all the loads (broken/frayed/undersized) so the other circuits flash as you have described.

HRG
Adding to that, make sure you have a dedicated ground from the truck wiring to the trailer wiring, I've seen where they use the ball and hitch as ground, not good.

And...if the trailer is fairly old, just buy a trailer light kit and forgo the troubleshooting if you haven't found the trouble in a short while.

Al
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  #6  
Old 09-08-2016, 07:00 PM
Lmbkiller Lmbkiller is offline
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Upon further inspection in day light, the ground wire trailer side is cut rite off, havnt fixed it yet but it should be simple and I'm thinking it will solve problem 100%
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  #7  
Old 09-10-2016, 01:41 PM
Lmbkiller Lmbkiller is offline
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Repaired ground and problem solved. Sure is nice when u find the problem, fix it, and problem goes away. That is usually only the case with trailer wiring 20% of the time 100% of the time
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  #8  
Old 05-15-2017, 10:28 AM
lazermule lazermule is offline
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Default Any Ideas on my issue?

I have a 2004 and a 2013 Jeep Wrangler. The lights on my trailer (Flat 4 wire) work great on the 2013 Wrangler and not at all on the 2004. The 2004 has the plug in harness adapter that plugs into the tail light harness and routes to the hitch. I installed it just last year and used a good amount of dielectric grease and such. The 2013 wrangler has the light plug (same 4 wire flat) factory installed.

When I put a meter on the connector on the 2004, I get 12v on the pins with the different connections as I cycle lights, brakes and directional. I ran a continuity test with the meter from one of the bumper to frame bolts on the Jeep to the tongue of the trailer and got good continuity so it has a ground through the hitch.

Is it supposed to be pulling a ground through the connector as well? What am I missing? The 2004 Jeep will not light a single light on the trailer.

Thanks,

LM
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  #9  
Old 05-15-2017, 10:47 AM
BPSTravis BPSTravis is offline
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One of the wires on your 4 pin connector should be a ground wire if i'm not mistaken.

All of the trailers i've worked on were the round 7 pin plugs but the 4 pin should have a white ground wire as well.

https://en.wikipedia.org/wiki/Traile..._North_America
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