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Trailer lights don't work

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Old 03-14-2007, 11:44 PM
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Join Date: Feb 2007
Location: McKinney, TX
Vehicle: 2013 Ford F150
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Trailer lights don't work

I have a ten foot trailer for a jet ski and the lights work except for the running lamps. Brake lights and blinkers work. Anyone know the solutin do this?? Is it a wiring problem or a fuse problem maybe? Thanks
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Old 03-15-2007, 12:27 AM
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Join Date: Mar 2005
Location: St. Charles, MO
Vehicle: 2000 Ford F-250 7.3
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Did you check ALL of your fuses?

Originally Posted by RockPick View Post
Having fun as a kid is one thing... being an absolute toolbox is another. You're the latter of that comparison.
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Old 03-15-2007, 09:21 AM
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Join Date: May 2005
Location: Colorado
Vehicle: 2003 Ford F150
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Trailer park lamp fuse?

If not check that you are getting juice on the 11 o'clock position in the 7 pin connector on the truck with the park lights on. Or..the brown wire on the 4 pin connector.

If the truck checks out then you either have bad bulbs or a short somewhere on the trailer.
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Old 03-15-2007, 12:40 PM
Join Date: Jul 2006
Location: Pearland, TX
Posts: 58
I'd definetely start out by checking fuses first, and then your trucks 7-pin or 4-flat connector with a test light. That would narrow it down to truck or trailer, and then go from there.

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Old 03-27-2007, 02:39 PM
G1K G1K is offline
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Join Date: Dec 2003
Vehicle: 2001 Ford Lightning
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I'm having the same problem. I checked both the running ligh locations on the 4 pin and 7 pin connectors and no power there. I checked all the fuses onder the dash, they're good. Where else should I check?

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Old 03-28-2007, 07:02 AM
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Join Date: May 2005
Location: Colorado
Vehicle: 2003 Ford F150
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If the fuses are good and there is no power on only one connector will be tracing for a short or corrosion for lost connection.

Have fun with that.....lots of time and most are not successfull.

If you are not successful, I would run a new wire and relay off your rear tail lights to get a switched running light and feed it onto the truck/trailer wiring harness. They make fused/relayed trailer wiring harness that will plug right into the tail light wiring so you won't have to splice into anything. Just tap into a power source for the relay activation. could always seek profession help from someone like me who does this for a living. It might be the most painless fix. There is a possibility that you missed a fuse or the trailer harness connectors just has some corrosion on it.
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