After wiring a plug for a to my factory 7-pin trailer receptacle wrong (right according to diagram)....I lost brake/shift interlock, wipers, radio, and electric windows. Also when I turn key to ON, not start, The Tach and speedo needles go all the way to high end..hold a few seconds and then go back to normal. Will start and wheels turn but interlock won`t allow shift out of park. I`ve learned how to get it out of park but want to know which relay /fuse has malfunctioned. When needles go high in ON positon ...I think I can almost hear a click/noise just before they return to normal position. I checked almost all the fuses related to symptoms but don`t know how/ or which one to check /change. Obviously related to trailer plug wiring mistake. Iactually found out the hotwire on the Ford is different from standard plug wiring diagram. I catually figure it out and the winch works but now nothing else does !!! Need help on relay/fuse. possibilities


Asked by Apr 06, 2014 at 11:25 AM about the 1999 Ford F-150 Lariat 4WD Extended Cab SB

Question type: Maintenance & Repair

3 Answers


I feel you have a blown fuse. If mine I would use multi meter or test light and start with first fuse checking all of them till you find the one that's blown. Not hard to do just time consuming. With the items you mentioned I would figure maybe an ignition fuse.


I'm speaking from an electrical standpoint only. How much amperage does the winch pull? I would never wire a winch into any "light" or trailer plug as they are obviously linked to other electrical considerations throughout the vehicle. Also, do not rule out the possibility the winch itself, has a short within it.


General Information: Auto manufacturers have basically pushed the 12 Volt standard vehicle system to it's limit. Just look at what has transpired since autos were changed from a 6 volt system. Your description as to what does not work now issustrates my point. Determine if only a fuse was blown, hopefully. Disconnect the winch from the trailer connection, and wire it directly to the battery with an inline fuse of the proper size.

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