2005 Ford F-150 Logo
Posted on Dec 26, 2009
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Which fuse is for the trailer lights - 2005 Ford F-150

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  • Master 984 Answers
  • Posted on Dec 28, 2009
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The aux fuse panel in the engine compartment on the 04-08 has nothing to do with the trailer lights ( that is ABS, clock spring illumination, 4WD and the diode for the AC compressor ).

All the fuses are in the CJB ( aka Central Junction Box, cab fuse panel ):
The trailer parking lamps
Fuse #10 and relay #201
Trailer Stop / turn lamps
R: fuse #36
L: fuse #42
There are a few others with the reversing lamps and the battery charge circuit ( for the 7 pin adapter ).

Bit easier than trying to read each line, is to download a PDF copy from Ford, so you can search on keywords ( in this case trailer )
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

squeely

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  • Ford Master 454 Answers
  • Posted on Dec 27, 2009
squeely
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I do believe its a relay and is located in engine compartment. your manual should have location of fuse/relay. i looked and looked thru my owners manual ....my wife looked in manual and found it on a graph. i apparently glanced over it. hope this helps. its a real ****** to get out.

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Where is fuse for trailer running lights on 03 F150?
The location of the fuse for the running lights on a trailer may vary depending on the make and model of your vehicle. However, here are some general steps to help you locate the fuse:
  1. Check your vehicle's owner's manual to determine the location of the fuse box. The manual should also provide a diagram of the fuse box and a list of fuses and their functions.
  2. Once you have located the fuse box, open it and look for the fuse labeled "Trailer" or "Trailer Lights." Some vehicles may have a separate fuse box specifically for trailer wiring.
  3. If you cannot find a fuse labeled for the trailer lights, check the fuses labeled "Parking Lights" or "Tail Lights." These fuses may also control the trailer's running lights.
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Remember to always replace a blown fuse with one of the same amperage rating. If the new fuse blows immediately after installation, there may be a wiring issue with the trailer or vehicle that needs to be addressed.
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I have a 2002 E 150 with the trailer light system already installed. The van lights all work but only the right trailer turn indicator light does not work. I have checked the problems thru the system and...
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Not sure which fuse you checked.
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Fuse # 5 is the fuse for the parking lamps, and the reversing lamps.

Next is the trailer tow adapter park lamp relay. This is what BJB Fuse #5 feeds, and the coil is operated by the truck's parking lamps. This is also in the BJB, Relay 201, it is the 1/2 size relay.

Not sure what you took a resistance reading from on the trailer tow adapter.

If you want, you can pull the trailer tow park lamp relay, and jumper the normally open contacts, which should provide power at the trailer tow adapters, regardless of the truck's lights.
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This is the wiring diagram for the trailer tow park lamps
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Mar 09, 2010 • 2001 Ford F150 Styleside SuperCrew
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I tried to connect a utility trailer but the lights wont work
most trailers don't have fuses, but rely on the car fuses, and if the car lights go on, that can't be it.
You need a test light.
Check if the current is getting to the trailer connection, then check at the trailer bulbs.
But the ground connection is the most likely if none work.
The trailer itself is the ground for the lights, but you need a brown wire from the trailer frame to car frame/ground.
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Also try http://www.etrailer.com/faq-wiring.aspx. They have a great website with lots of info.
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You will need to get a 12 volt test light and check the trailer connector for a voltage signal to the trailer, it may also have seperate fuses under the hood for the trailer lights if the system is factory installed, federal law requires the 2 systems be isolated, if there are blown fuses find the short in the trailer before replacing fuse(s), with no exceptions the short is always in the trailer. Hint, check the fuses 1st.
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