Question about 2003 GMC Sierra 1500

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Trailer running lights

My running lights coming from the trailer plug do not work, all other lights do and the running lights on the truck work as well. Is there a separate fuse or fusable link just for the trailer running lights?
Thank you.

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  • bassnut Feb 17, 2009

    My brake lights and turn signals work fine on my boat trailer however my running lights do not work at all. I drive a 2006 Silverado and my truck lights all work fine.Not sure where the problem is.

  • Anonymous Mar 08, 2009

    Ditto!

  • microburst May 11, 2010

    Hi I have a Dodge Caravan 1999 and all lights are working accept the driving lights on the drivers side, everything els works!

    What do you think I should check> I did check the wiring on trailer is there a fuse for one side somewhere?

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Check trailer ground

Posted on Jan 18, 2009

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Trailer wiring problem. Tow vehicle is a 2008 Grand Caravan with 4 wire plug. Double checked, plug function works fine. When trailer is plugged to tow vehicle with tow vehicle lights OFF the trailer...


Most likely the brown wire from the trailer connector is connected to a constant battery voltage source, and it should be connected to the vehicle running light circuit, however someone might have wired the trailer connector up that way on purpose so that the trailer does not draw power from the vehicle running lights and possibly damage the vehicle running light circuit. (Dodge/Chrysler vehicles do have delicate lighting systems) Here are some images to help assist you, and the 4 way connector is the same as the 5 way connector just without the blue wire for the trailer brakes.


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This is based upon being a new body style 2004, not the 2004 Heritage or Lightning models, those are different fuse & relay locations.

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The truck is protecting itself from the load impose by the trailer.. Chk the plug on the truck for wire gauge size. Turn any electrical loads off on the trailer, any and all. If fuse still blows then the fuse is either underated or the trailer has a dead short. In fact turn trail main power panel of. All lights work you say. So ck the inverter for defect byturning off the inverter on one of the trailers.

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There's a break in the connection on the running lights..either on the car side of the plug or the trailer side.. use a probe light on each terminal of the car side plug with the running lights turned on...if there's power, then the problem is on the trailer... check for a damaged wire near the tongue ...usually the culprit..
Good luck... email if you need more help..

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