Question about 2011 WLRA-50 Ford F550 Truck Crew Cab Power Window Regul

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I have a 2011 F550 that was a cab chassy, I put a flatbed on it and everything worked when I went to hook up the trailer plug on the flatbed I lost reverse lights.

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It may be due to a bad ground wire. also check your connections to the wiring harness. it may either need redone, or just cleaned up, and sealed with electrical tape. I've seen this happen to a few trucks. if that doesn't work, check your fuses, something may be askew that way. if it's popped, check the wire to make sure it wasn't pinched.

Posted on Oct 17, 2013

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Posted on Jan 02, 2017

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I have lost power to the trailer lights plugs but only to running lights and I cannot locate the correct fuse. Blinkers and stop okay.


Are you sure you lost 12vdc at plug by checking it with a test light?
I said text light and not a meter...
Sometimes a bad ground will cause running lights to dim, where brake and turn signals will still work, but at a lower brightness ..
Fuse for running light hooked in with vehicle lights as are all power for trailer lights....

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I have a 2005 ford f550 with factory brake controler & factory trailer wire plug. On the trailer wiring plug I am not getting power to the turn signals or brake lights. The turn signals and brake...


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Trailer running lights Fuse


Go to Autozone.com and register your truck for FREE. Then you can get access to Chassis wiring diagrams and fusebox layouts. The plastic cover on your trailer plug will have the id for each pin in the plug.

The factory chassis diagram should show the fuse providing power to the individual post on the plug.

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1 Answer

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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1 Answer

Hooked my 2007 Sprinter camping trailer to the factory lights/brakes hook-up located below bumper of my 2005 Silverado 4x4 extended cab truck. Everything works fine except for the right trailer turn...


Is this a 4 way or 6 way connection system? If your truck is wrong, then all factory equipped trailer package harnesses would be wrong, tell your trailer guy...I don't think so.
Is this the first trailer you have hauled?
Let me know, and we will go from there.
REgards,

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