Question about 2004 Ford F150

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I have a 1998 ford f 150 and can't get the trailer turn lights working. i checked the fuses all are good so I think it's a relay but I don't know wich one is for the trailer turn lights and the book doesn't say. so does anyone know which relay # i need to check and is it in the panel inside the truck or one of the three boxes under the hood?thank you in advance

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A 1998 has the engine mini fuse panel installed, but it is not documented in your owners manual. Don't know why this is.

You would want to open the engine mini fuse panel, and check the 20A fuse.
This is a picture with the relays documented, as this is not covered in either the 1997 or 1998 owners manual.
I have a 1998 ford f 150 and can't get the trailer - 820b2d4.jpg

Chances are the fuse supplying power to the L & R trailer tow stop / turn relays is blown. Common source for this problem, but could also be the relays ( possible but not probable that both went at the same time ).

You can download the 1997 Owners manual and get the page that has the engine mini fuse panel picture and info.
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Posted on May 03, 2010

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If you have never towed or used the trailer plug before then I think you are in the right area. On vehicles equipped with a towing package, Ford shipped the vehicles with a loose parts bag. In this bag (and depending on model, equipment, etc) were relays/fuses/connector plug and some instructions. The relays/fuses were to be used to energize the trailer connection and were fitted to a relay/fuse box under the hood. If you have the owners manual then you should be able to locate a layout of that box and determine if the relays/fuses were ever put in place and if not then acquire them from a local parts store or your dealership.

Posted on Apr 27, 2010

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1 Answer

I need to know the location of the trailer light fuse on a 1998 Ford F-150, 6 cylinder


If you are talking about the trailer tow stop / turn lights, this is in the Engine Mini Fuse panel, which is not documented in the 199 Owners Manual for some reason.

It is in the 1997 OM.

sscullys_178.jpg


If you want a better picture, you can download the 1997 Owners Manual from Ford :
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

Here is a picture from a 1998 MY truck, the cover is off of it.
sscullys_179.jpg

Here is a picture from the Top that shows the relay block as well ( not documented too well in the 1998 OM either )
sscullys_180.jpg

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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 )
20 - Left Stop / Turn fuse
19 - Right Stop / Turn
5 - Trailer tow reversing lamps & Trailer Tow parking lamps

Cab Fuse Panel
23 - fuse for the relay for the trailer tow battery charge circuit

All of these are in the owners manual

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

Oct 04, 2010 | 2005 Ford F-150

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I just rewired my 20'deckover trailer. I used good quality lcd's. I have the 7 and 4 pin plugs. everything works but the parking lights on both plugs. I have a 2006 f-150 extended cab. bought a test plug...


Did you check the fuse for the trailer tow adapter parking lamps ? This is a separate fuse from the truck's parking lamps.
Fuse #10 is the Trailer Tow parking lamps ( via the trailer tow parking lamp relay ) and this is the same fuse for the trailer tow reversing lamps ( via the trailer tow reversing lamp relay ).

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

Diagrams for the Trailer Tow adapter :

3e4eab1.jpg

a8323b6.jpg

Feb 21, 2010 | 2006 Ford F-150

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The trailer tow adapter parking lamps is fuse #10 in the cab fuse panel. There is also a trailer tow parking lamp relay that powers them, which could have a problem as well.
Start with the fuse, and maybe check both the 7 pin and the 4 pin for the parking lamps, could be a corroded pin on one of them causing the tester to not see the power on the pin.

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I have a 1997 Ford F150 4x4 Supercab Stepside with 5.4L and factory towing package. On the factory trailer wiring plug I am not getting power for turn signals or brake lights. Running lights and brake...


It is a possible option that the relays for the Stop / Turn are having an issue or the fuse in the Engine Mini panel is blown ( page 142 of the 1997 owners manual )

On the 1997/98 MY this is in the aux relay box in between the Engine Compartment fuse panel and the engine mini fuse panel.
9349aa0.jpg

The output of the MFS ( Multifunction switch ) triggers the relays, to use the trailer tow fuse to operate the trailer lamps. The fuse to supply power to the Normally Open contacts on the trailer relays should be hot at all times. You can verify this with the diagram below by metering from pin #3 to pin # 2 [ground for coil] or to another known ground.

These are 1/2 size Ford ISO relays, and can be jumpered to make testing easier ( and with this diagram you can bench test them with a meter to check resistance over the Normally Open contacts, when applying power and ground to the coil ).
3a3e4ca.jpg

I am not 100% sure on the 97/98 MY F-150 about the location of this connector, but the 99-03 have all the wires to the rear of the truck via a connector along the driver's side frame rail, that you can check for ( easiest with the spare lowered )
777e616.jpg

Start with the Fuse in the Engine Mini panel, to see if the 20A fuse is good and work back towards the trailer tow adapter via the relays. I am going with the obvious blown fuse for the Stop/Turn lamps for the trailer.

Dec 11, 2009 | 1997 Ford F150 Regular Cab

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

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1 Answer

Trailer connection not working need to know which fuse to change 2005 Ford F150 Lariat


Trailer Tow reversing relay ( non serviceable ) and the Trailer tow parking lamp relay are both fed from Fuse #10 ( coil on reversing relay is fed from reverse lamps & coil on parking lamp relay is fed from the parking lamps ).

Trailer Tow battery charge relay is fed from Fuse #106 ( coil is fed by fuse #13, hot in start / run position from key ).

Right Stop / Turn is fed from Fuse #36 ( powered from MFS circuit for truck stop/turn )
Left Stop / Turn is fed from Fuse #42 ( powered from MFS circuit for truck stop/turn )

Parking lamp is

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1 Answer

Pass. side trailer turn and brake lights out 1999 ford explorer


if your vehicle lights are working all the fuses will be good. follow the cable from the towing socket on your vehicle , it will most likely go behind one of the rear lights to connect into your cars system,
check your tester where the cables join and you should find the problem. hope this helps.

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