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Have a Ford F-150 2005. My boat trailer tail lights do not…

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Have a Ford F-150...

Have a Ford F-150 2005. My boat trailer tail lights do not come on but flasher and brake lights are OK. Wiring looks OK, connections cleaned without correcting problem. Could this be a fuse issue? My name: Gayle Brewer, Longbranch, Washington. Thanks

Mechanic's Assistant: Thanks. Can you give me any more details about your issue?

Lights worked OK in past, now this new problem. Trailer wire connector is standard flat 4-plug type.

Submitted: 2 years ago.Category: Ford
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Answered in 28 minutes by:
1/23/2016
Ford Mechanic: Edward, ASE Certified Technician replied 2 years ago
Edward
Edward, ASE Certified Technician
Category: Ford
Satisfied Customers: 3,769
Experience: ASE certified. Auto Transmission rebuilder for Ford Motor Co. from 91 to 2000
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Hello, Eddie here and I will try to help. It very well could be a fuse issue, there are a few fuses on the central junction box that need checking first. Do you know where the interior fuse panel is on the passenger side up under the dash?

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Ford Mechanic: Edward, ASE Certified Technician replied 2 years ago

Alright, do you have the owners manual in the truck by chance?

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Customer reply replied 2 years ago
have manual.
Ford Mechanic: Edward, ASE Certified Technician replied 2 years ago

alright, page 227 gives you a breakdown of the interior fuse panel and the fuse numbers, I would like for you to check fuse number 10, it is a yellow 20 amp fuse, that powers the trailer park lamp relay, and if that fuse is good, I want to swap the relay next. Are you working on it now?

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Ford Mechanic: Edward, ASE Certified Technician replied 2 years ago

Let me know if you find anything there with the fuse, the parking lights work on the truck correct?

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Customer reply replied 2 years ago
Not working on it now, will have to wait until tomorrow AM.
Ford Mechanic: Edward, ASE Certified Technician replied 2 years ago

No problem, We can try it in the AM. Thank you.

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Customer reply replied 2 years ago
Park lights work OK. Fuse #10 is good, not blown. What to do next?
Ford Mechanic: Edward, ASE Certified Technician replied 2 years ago

Hello, can you swap that trailer lamp relay? Im thinking its position 201, but Im only on cell service right now, you have the owners manual and looking at the diagram of the interior fuse panel?

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Customer reply replied 2 years ago
in truck looking at fuse panel and diagram. there is a #201 relay. Don't know what is meant by swapping relay?
Ford Mechanic: Edward, ASE Certified Technician replied 2 years ago

look at the delay relay, swap it if it is identical, should be a part number on the trailer tow lamp relay, I want you to swap it with an identical relay in the fuse panel if possible, your sure this trailer isnt the issue right? Could you plug it into another truck just to be sure the running lights do work?

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Customer reply replied 2 years ago
Don't think trailer wiring is problem (checked that first) but not 100% sure. Will see if a neighbor can hook up his vehicle to trailer to test that out before going further with truck electronics. Will let you know if need more help with truck. Cheers.
Ford Mechanic: Edward, ASE Certified Technician replied 2 years ago

Sounds good, let me know what happens. thanks, ill be home later and I can pull the wiring diagram if needed.

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Ford Mechanic: Edward, ASE Certified Technician replied 2 years ago

I'm back home now. Any luck with it?

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Customer reply replied 2 years ago
Good timing. Neighbor Larry just hooked his vehicle up to trailer and trailer lights are all OK. He used his tester to confirm low but present voltage to park/trailer light channel of truck light hitch, and good voltage to brake and flasher channels. Doesn't think this is a fuse problem. Thinks problem is most likely in wire connection to truck light hitch socket, which I will work on if I can get truck to a dry spot to work on (raining non-stop here). Big thing is that trailer OK; sold boat and new owner picking up in a few days.
Ford Mechanic: Edward, ASE Certified Technician replied 2 years ago

Alright, good deal, so the problem is in the truck, Swap that trailer running lamp relay in the interior fuse box with another one if you can, and if that isn't it, be sure check all the fuses out under the hood as well. Test light works well for testing them you can just touch each side of the fuse blade and if the light comes on, you know the fuse is good. I believe you'll find your problem either in the running light relay, or that connection between hitch socket and trailer. Let me know if you have any further questions. Thank you.

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