Question about 1991 Ford F350

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I Have no tail light to my trailer plug on 1991 F 350 with tow package and have changed light relay

And my marker lights on my fenders and tail light bar below tailgate doesn't work either but have fire to tail light relay . How do I get fire from relay to tail lights ?

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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samson-1
  • 153 Answers

SOURCE: 2002 explorer tail light for trailer

There is a small black plastic box under the hood that contains several circut breakers. The breaker for trailer towing is located here.

Posted on Oct 09, 2008

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  • 15 Answers

SOURCE: parking & brake lights dont work on gooseneck trailer

follow the wires back behind the bumper toward the front of the truck, check the next connector you find for corrosion.

Posted on Apr 16, 2009

smartr10U
  • 1305 Answers

SOURCE: the left turn signal is inopt for the trailer ,

Check the fuses as there is separate fuses for left, right and tail... they're located in the engine compartment fuse box.

Posted on Jun 06, 2009

sscullys
  • 984 Answers

SOURCE: 2001 F150 supercrew w/ factory towing - No tail lights on trailer

Not sure which fuse you checked.
The Engine Compartment Fuse Panel ( Battery Junction Box / BJB ) is where the fuse is for the trailer tow adapter parking lamps.
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.
4418e16.jpg

This is the wiring diagram for the trailer tow park lamps
c2f0bcb.jpg

Posted on Mar 09, 2010

SOURCE: Running lights and marker lights on trailer stopped working. Brake and turn signals work. Which fuse # or relay # needs to be replaced.

If you have your owners manual it will be in there.

Posted on Dec 13, 2012

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Trailer marker light fuse 2006 tundra Double cab


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Have a 1994 Dodge Ram 1500 4x4 1500 with wiring problems. The original problem was a brake light out on the drivers side. I changed the tail light plugs. With head lights off I had brake lights with head...


Your truck may have had the factory trailer tow package, but that did not come with a wiring connector in that year. There should be a wire harness under the rear of the truck near the center of the bumper with 7 wires of the following colors/characteristics -

Red/Orange - +12V Battery (Thick Wire) From fuse #8 (40A)
Black/Orange - Tail Markers (Thick Wire)
Light Blue - Trailer Brakes (Thick Wire)
Violet/Black - Backup Lights (Thin Wire)
Dark Green/Red - Left Stop/Turn - (Thin Wire)
Brown/Red - Right Stop/Turn - (Thin Wire)
Black - Ground - (Thick Wire)



Under the dash, the brake controller wiring should be -

Red/Orange - +12V Battery (Thick Wire) From fuse #8 (40A)
Black/Orange - Ground - (Thick Wire)
Light Blue - Trailer Brakes (Thick Wire)
White/Tan - Brake Light sense - (Thin Wire)

Hope this helps.

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1 Answer

2001 F150 supercrew w/ factory towing - No tail lights on trailer


Not sure which fuse you checked.
The Engine Compartment Fuse Panel ( Battery Junction Box / BJB ) is where the fuse is for the trailer tow adapter parking lamps.
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.
4418e16.jpg

This is the wiring diagram for the trailer tow park lamps
c2f0bcb.jpg

Mar 09, 2010 | 2001 Ford F150 Styleside SuperCrew

4 Answers

F150 Ford 1998 is there a fuse for a trailer and where is it located? Thank you


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
Fuse #16 - Trailer tow battery charge and stop/turn lamps
Fuse #28 - Trailer tow electronic brake

2. Instrument Panel Fuses ( cab fuse panel by hood release )
#23 - trailer tow battery charge relay

Nov 11, 2009 | 1998 Ford F150 Regular Cab

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Trailer running lamps will not work


Your running lights/marker lights and tail lights are on the same circuit. I all thetruck lights work, the problem is in the plug or plug harness.

Jul 01, 2009 | 2007 Chevrolet Silverado 2500HD

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Trailer wiring harness diagrams W/o internet goose chase


Try this Link www.dodgeram.org/tech/mods/electric/trailer_wire.htm

Jun 30, 2009 | 2004 Dodge Ram 1500

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