Question about 2003 Ford F150 Regular Cab

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Running lights on trailer blowing fuses in my truck

Running lights on trailer blowing 20 amp fuses in my truck. Where do i look for the problem. I put 30 amp in and some light work .

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If it only happens when the trailer is plugged in you have a short in the trailer. wiring or the bulbs have corrosion or water in the connetor. Same thing if the trailer is unplugged. Check the truck lights

Posted on Aug 02, 2009

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Posted on Jan 02, 2017

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I have a 2003 ford F150 and I bought a factory plug in trailer harnes but the only light that work now is the running light I got back under truck and tried the harnes with a tester and it seem the trailer...


The fuses for the trailer tow adapter are in the normal fuse panels.

Engine Compartment fuse panel
101 - Is the battery charge circuit ( hot in run position )
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If you did not get an owners manual with your truck ( purchased used ), you can download one from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

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This is fuse # F10 & The half size ISO relay, R201 in the fuse panel in the passenger side kick panel.
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There are a few fuses for the trailer tow adapter.

1st, is theodd location on the 97-98, engine mini fuse panel has a 20 A fuse forthe stop / turn lamps. Have seen it covered in tape from the factory onsome 97-98 MY trucks.
This is on page 142 in the owners 1997 manual, all the revisions for the 1998 owners manual I have seen do not include this fuse box for some reason.

Download a PDF version from Ford, for the 1997 MY at :

https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

This is a picture of the Power Distribution Box, additional relay box and engine mini fuse panel with the covers off. The 20A in the upper right panel with the red base, is the trailer stop/turn fuse.
3b8aa6c.jpg

The others :
1. Power Distribution Panel / engine compartment fuse panel
Fuse #1 - Trailer tow back-up and tail lamps
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Fuse #28 - Trailer tow electronic brake

2. Instrument Panel Fuses ( cab fuse panel by hood release )
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