Question about Ford Expedition

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When I HOOK UP MY TRAILER LIGHTS TO ANOTHER VEHICLE THEY WORK FINE, but when I hook them up to my 98 expedition my trailer park lights do not work but the brake lights and blinkers work fine. I checked all the fuses under the dash and they are ok. I do not have the owners manual to the vehicle. Checked the connectors that go to the trailer plug and they appear to be ok . Any ideas on what might be my problem?

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Check fuses in the engine compartment (electrical dist. box) Usually the fuses for trailer lights are in there.

Posted on Dec 31, 2010

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Where is the trailer light fuse control on a 2007 Ford Expedition


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your vehicle has a "integrated power module". its a fancy name for a smart fuse box. What likely happened is there is a problem with the trailer wiring. The power module detected the fault and shut down the running lights. The power module will need to be reset at the dealer.

Fuse 15 is a 50 amp fuse for the park lamp relay
Fuse 32 and 34 are 10 amp fuses for the right and left park lights
Fuse 33 is a 10 amp fuse for the trailer park lights.

After it is reset I would not plug in the trailer until the fault is located and repaired.

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