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No trailer running lights

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Old May 24, 2007 | 10:17 PM
  #1  
guessrow's Avatar
guessrow
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No trailer running lights

Hello,

'04 SCrew- no towing package, but do have factory 4 prong plug.

I have a test lamp on my 4 prong plug, but don't have power to my running lights. The left and right blinkers work as they should. owners manual shows fuses for both l and r blinkers on the trailer, and shows a relay for the running lights. Ford calls it trailer parking lamp relay, I assume were talking about the same thing. Have swapped a couple relays, so I know they are good also.

Now what?? Am I missing a fuse somewhere?? bad wire somewhere?? anything else??

TIA- jim
 
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Old May 25, 2007 | 08:31 AM
  #2  
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Check the fuses in the power distribution box under the hood. Small black box on driver's side.

Trailer lighting fuses are there as well.
 
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Old May 25, 2007 | 09:07 AM
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KevinM
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There is probably a fuse missing or it's blown.
 
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Old May 25, 2007 | 10:39 AM
  #4  
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black04lariat
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there is a relay that needs to be plugged in to the fuse box. i remeber that i had to do it. it supplies power to the trailer....i dont remember if running lights are included in it, but i needed to put it in to get all the power back to my trailer. it was in the same bag as my connector for my brake controller was. but since you dont have the tow package i dont know. i am guessing it is that relay you need.
 
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Old May 25, 2007 | 11:25 AM
  #5  
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Originally Posted by black04lariat
there is a relay that needs to be plugged in to the fuse box. i remeber that i had to do it. it supplies power to the trailer....i dont remember if running lights are included in it, but i needed to put it in to get all the power back to my trailer. it was in the same bag as my connector for my brake controller was. but since you dont have the tow package i dont know. i am guessing it is that relay you need.
The relay you are talking about is only if you have the tow package and the 7 pin connecter.

The flat four way so be plug-n-go, no relay required.

It could there be a short in the wiring somewhere...
 
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Old May 25, 2007 | 01:55 PM
  #6  
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thanks. good to know.
 
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Old May 25, 2007 | 08:57 PM
  #7  
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96f150
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Make sure you have a good ground on your trailer as well. I have seen some funny things when circuits have bad grounds!!
 
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