Trailer Light Problem

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  #1  
Old 05-01-18, 04:37 PM
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Trailer Light Problem

I am sure this is the first post ever with trailer light issue. My 2000 Tracker trailer has an odd intermittent problem. I have LED lights and in normal headlights on mode, the left LED sometimes illuminates both the tail light and the brighter brake light. When in this failure condition, the turn signal will not flash on the trailer (OK on truck). As I said this is intermittent, sometimes it cures itself and works normally. No problems with the right side. No idea how to troubleshoot this. I have a flat four connector between trailer and 2002 Tundra.
 
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Old 05-01-18, 04:43 PM
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If that is a combination bulb unit (directional/parking)...... it's losing ground.
It could be the bulb socket or ground to that fixture.
 
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Old 05-02-18, 04:03 AM
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......or some bad wiring between the plug and the light.
A small plug-in trailer light tester is invaluable in ensuring problems are with the trailer and not the vehicle.

 
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Old 05-05-18, 08:33 AM
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Thanks

I've ordered an inline flat four tester. Out of town next week, but will trouble shoot the week after.
 
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Old 05-06-18, 06:54 PM
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Make Double sure you have a good ground, (probably a white wire) to a clean bolt or screw on the trailer frame. I have been pulling trailers for 40 years as part of my job, and unless you have a bad wire to the lights, or brakes, the ground is usually what causes intermittent problems.
 
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Old 05-17-18, 08:29 PM
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I got the flat four inline tester and of course since then the lights have worked perfectly. Mother Nature abhors boat trailers.
 
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Old 05-17-18, 11:29 PM
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No problems with the right side.
Since it only affects one side.... it's not the main ground to the trailer. It's the specific ground at one light fixture on the left side.
 
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