Question about 1991 Ford F150

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Greetings, i have a 1991 Ford 150 pickup and will be installing a wiring harness for a 7-pin receptical for towing a trailer. Do you know of any step-by-step instructions for installing the harness on this make/model of pickup?

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Try http://www.etrailer.com/faq-wiring.aspx. This should help. Mike

Posted on Sep 30, 2009

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2014 triton mn. How can I connect 7-pin trailer socket into existing wiring harness?


the simplest way to do this is to go to a tow bar installer shop and buy the harness ( around $25.00 aud)
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the wires for the trailer are properly installed and all you have to do is wire the plug connection according to the wiring diagram that came with the plug

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I need a wiring diagram for a 7 wire system


I am guessing you mean the 7 pin trailer tow adapter.

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The 2005 trailer tow adapter wire diagrams
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Oct 23, 2010 | 2004 Ford F150

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I am connecting a trailer towing harness to my Nissan 2004 Titan (2wd), to tow my boat and need to know what the color codes to the parking, stop, and reverse wires are.


if you go to the parts store they make them ready to plug in you will have to just unplug the tail lights and plug the wire harness inplace of it then itll plug back into the original spot.

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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 :

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Feb 21, 2010 | 2006 Ford F-150

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I have a 2008 Ford F 150 with factory installed trailer wiring. I bought a trailer plug tester. It shows the tail light function to be dead. Brake lights, turn signals all work. Any ideas?


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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Electrical towing wiring problem on Grand Caravan 2006


Well the BEST way to fix that is take the Van AND Trailer to the dealer and make them check it over and get it working. Sounds like they screwed up., and are trying to blame the trailer. The 4 pins are easy to check Running lights, Left turn, Right turn and Ground. I suspect the 7 pin is wired wrong. I dont know why they put a 7 pin wiring plug on? Those are used for largeer trailers that need a battery feed and electric brakes

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No power to the trailer light harness.


The fuses for your truck also serve the trailer lights, so there is no seperate fuse. When there are no lights at all the first thing to suspect is that the ground is poor. That just means that there is corrosion between the ground wire and the frame of the truck. In the back of the truck trace the ground wire from the tail lights to where it is attached to the frame. Disconnect the wire from the frame and use emery cloth to clean up the frame and the wire contact point. Then be sure to tighten it down real well.

Nov 18, 2009 | 1991 Ford F150

1 Answer

I do not have power on the aux. terminal in the trailer plug on a 2008 dodge ram. Any ideas?


You have got 7 pin trailer connector that was included in the optional trailer tow package. This trailer tow package also includes an electric trailer brake wiring provision that terminates at a connector located on top of the large body harness connection under the instrument panel to the left of the break pedal, as well as an electric trailer brake pigtail harness and an instruction card that are stored in the glove box when the vehicle is shipped from the factory. You will need to add an electric brake controller of your choice that will plug-in to the harness and that will also give you power on your auxiliary circuit.

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u must install the fuses for the system in he underhood heavy duty fuse box, it will be marked trailer tow

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Installing a 7-pin trailer towing recptical on a 1991 Ford F150.


I believe you can look up the manufacturer of the trailer plug kit and find the wiring diagram there. On alot of the trailer plug kits, they have pics and diagrams in the package. The 7 pin plug (truck side) is available with the pig tail set up that plugs directly into the wiring harness for the lights. Then all you would have to worry about is the 2 wires for the electric brakes.

Nov 29, 2008 | 1991 Ford F150

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