trailer lights not working right - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
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post #1 of 11 Old 06-27-2011, 02:19 PM Thread Starter
tom85
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trailer lights not working right

so the other day i hooked up me trailer and the brake lights turn signals all work but when i turned on my driving light i had no trailer light. Its the 4 prong connection. Any ideas? Thanks

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GAS IS ON THE RIGHT BRAKES ARE FOR SISSYS
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post #2 of 11 Old 06-27-2011, 02:33 PM
jerry cole
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check trailer wiring on truck plug, left turn, right turn, taillight, and ground. if they work correctly problem with trailer.
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post #3 of 11 Old 06-27-2011, 02:38 PM
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Fuse under hood called "trailer lights".

2004 Dodge 2500 4x4 gasser.
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post #4 of 11 Old 06-27-2011, 04:04 PM Thread Starter
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ill check both when i get home but its weird that it works with driving lights off then when i turn the lights on the trailer lights dont work

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GAS IS ON THE RIGHT BRAKES ARE FOR SISSYS
05 Dodge Ram 1500 qc HEMI 4x4
4x4 truck club #69
twiggy HID light club #18
-K&N cold air in take, superchips flash paq, MBRP single out cat back, 180 deg thermostat, projector head lights, HID 8000k head lights and fog lights, thundervolt shorty plug wires, helper springs, hemi decals, blue led dome and map lights, pacesetter long tube headers and y pipe,ready lift and procomp 35" AT
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post #5 of 11 Old 06-30-2011, 10:30 AM
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Figure it out? I had the same problem you mentionsed and about pulled my hair out untill someone mentioned there was a seperate fuse for the trailer lights.

2004 Dodge 2500 4x4 gasser.
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post #6 of 11 Old 07-05-2011, 11:40 AM
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Depending on where you live the 4 pin connector on the bottom of the bumper could me corroded as all get out. Also it sounds to me like you have a ground issue on the trailer itself.

Check to make sure all the lights are grounded right, I had to run grounds from the connector on the trailer to the rear lights to get the running lights to work right on my wave runner trailer.

Mike

Mine = 2010 Dodge Ram 1500 TRX QC 4x4 HEMI
Hers = 2010 Jeep Grand Cherokee Limited 4x4 HEMI
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post #7 of 11 Old 04-11-2013, 08:00 AM
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Did you ever find out what was wrong with the truck? I have this exact problem and I cant find the problem...
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post #8 of 11 Old 04-11-2013, 09:13 PM
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A multimeter or even a test light will tell you everything you need to know.

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post #9 of 11 Old 08-12-2013, 01:28 AM
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I have had that problem with almost every tow vehicle I ever had. It is the ground on your truck. Most likely corroded or not installed properly.
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post #10 of 11 Old 09-19-2016, 06:29 PM
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Quote:
Originally Posted by Big Thirsty View Post
Figure it out? I had the same problem you mentionsed and about pulled my hair out untill someone mentioned there was a seperate fuse for the trailer lights.
Where is the fuse for the trailer light? I have the same issues and I have a 2011 dodge ram 1500
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post #11 of 11 Old 10-29-2016, 05:57 PM
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Ok, If on a straight wired trailer like a cargo or flat bed or boat trailer or some travel trailers where the battery on board the trailer doesn't help power the lights.....Then this is 9 times out of 10 a ground issue. The ground connection is just good enough to run the break lights etc but when adding the load of the running lights, the ground "snaps" and all the lights go out. This can easily be assessed buy taking a piece of wire and either through alligator clips or using a clean bolt area to ground from and running the wire in the same manner to the trailer. This makes a better clean ground and the lights should then all work. Now if you have a ground wire running from your trailer plug on the tow vehicle to the trailer, you need to clean up where it connects to the trailer frame or run a new ground. In ball hitch trailers where it is grounded through the ball, you need to run a good ground wire from your tow rig to your trailer.

If the fuses are blowing then the same thing can be happening above and the same assessment can be done with a clean ground. If the ground doesn't fix the problem of blowing fuses, then it is most likely a short in the trailer wire where the positive side is hitting the ground. This could be in the wires or in the light it's self. This will be a long process and I would start by pulling the bulbs. Then turn on the lights and if the line blows it is most likely a bad wire. If not then start putting in bulbs till the fuse blows then you know which socket is bad.

If you have a trailer that the batteries in the trailer help the trailer lights (usually longer trailers or 5th wheels) then god help you because it could be any number of things. Best bet is to get a good battery, separate from your tow vehicle, and set it next to the trailer plug on the trailer and start plugging (FUSED) wires in and see what blows and how.

With in my friends and family we have about 20 trailers of all types and I am the only guy that knows wiring. I can't begin to tell you the horror stories.

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