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Discussion Starter #1 (Edited)
Problems with my trailer blowing out the backup light fuse on my 2004 F150 XLT and no running lights on trailer.
I re-wired the trailer, ground, two wires to right light, two to left light. On the trailer, brake lights work, blinkers work,
but no running lights when I turn the lights on. Lights on truck work but for the backup lights...bulbs are ok, but blows the fuse.
They are the correct bulbs in the trailer, stop/tail/turn.
I removed all bulbs from the trailer lights and still blew out the backup light fuse on the truck.
ALSO, when the backup light fuse is blown on truck, brake and turn works on the trailer, but no night running lights.
Duck boat works good, running lights on the trailer work when I turn lights on the truck and no blown fuse.
I cannot figure this out and if anyone has ANY SUGGESTIONS, PLEASE DO!
Thanks,
Bulldog44...
 

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Does that trailer have hydrolic brakes?
 

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Your trailer shouldn't be hooked to the back up light pin on your truck unless it has hydrolic brakes, or a back up light on it.
 

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Discussion Starter #5
After doing some more reading, the truck may have the ground hooked to the backup lights...But this still does not explain why my boat trailer works and does not blow fuses.
Ground on trailer has to be working as I have brake and turn lights working...
Headaches...nothing but headaches... ;-)
 

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Does Boat* trailer have brakes?

And are you usin 4 flat or 7 round?

Using same plug on truck for both trailers?


Posted via TapaTalk for iPhone6
 

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Discussion Starter #7
It's a single axle trailer with no brakes.
I am going to get an adapter to go from a 4 pin to 7 pin.
It has both factory hook ups, came on the truck.
 

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I meant the boat trailer sorry... Typo... Trying to figure out why one works and the other doesnt. Means it's got to be in the trailer somewhere if everything is the same at the truck.
 

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Discussion Starter #9 (Edited)
I just re-wired the trailer, 4 flat hook up...Easy enough, hook ground, run two wires left, two wires right. Brake and turn lights work great, but no running lights (night time). Ground could be the problem, but brake and turn works.
Boat trailer is single axle, wires running through trailer look like crap, but work (brake, turn and running at night).
I just bought a 7 blade to 4 flat adapter to see if this would solve the problem...we will see tonight!
Thanks!
Bulldog44...

Been thinking on this...
Could it be I need to ground the taillight fixture themselves? Brown wire is running light, green and yellow are brake/turn. Side running lights are just hooking up the brown, and the side running light fixture is grounded to the frame when attached. It's possible I'm not grounded to the frame with the taillight fixture.
BUT, I may have tail lights on day or night....which I can live with...
 

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Discussion Starter #10
FIXED!!!
Took off lights, cleaned metal to metal contact areas real well, re-attached and snugged the bolts to where they made contact against the metal of the trailer and bingo...running lights, and no blown fuse! The problem was the light fixtures were not grounded.
Thanks for the help,
Bulldog44...
 
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