Question about 2003 Ford Expedition

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Trailer running lights don't work but turn light and brake lights do work?

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Trailer running lights don't work, brake and turn signals work fine


check for broken or loose wires in plug and what you plug it into. Check the wiring is correct.

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I have recently replaced the wiring in my utility trailer and mechanic has tested lights when in the shop and says they're all working fine. Hooked it up to my pathfinder and lights were not working. ...


lights on the trailer are supposed to only work when the vehicle has its lights turned on. brake light problems is easy to figure out. it should run off a yellow wire for driver and a green for passenger. see if you have power with brake on. if so check the bulb. if not then check your 4 way flashers which run off the same general circuit. if 4 ways work but no brake lights double check your converter connections.

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2001 f 150 extended cab. trailer lights were working. had to replace a trailer light uhit because it was broken. now lights do not work properly. running lights work. turn signal only works if running...


The description of the problem is very confusing. If the trailer is disconnected, do all of the functions work OK? If so the problem is with the trailer wires. If all worked before you replaced the light, then thats where the problem lies. The turn signal/brake lights are a seperate circuit than the running lights. The brown should be hot with running lights, and the yellow and green are the turn/brake signals. The trailer lights should be grounded to the trailer frame, and the frame connected to the white wire, Make sure the white wire is connected to the plug on the truck side and connected to the frame of the truck. The turn signal that works with only the running lights on doesnt make sense, and grounds are the most common item. Some Ford trucks have seperate fuses for right and left. There a small fuse box under the hood, near the brake booster.

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Utility trailer wiring to 1998 Dodge Carivan


Trailer end; Red=Brake
Brown=Running lights
Yellow=Left
Green=Right
White=Ground
You will need a turn and brake signal box IF, you have different bulbs for brake and turn lamps. If the brake and turn bulbs are one(red)lens than no box will be required. Thanks, Dana

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1 Answer

Running lights work but not brake nor signal lighys to my trailer


check the trailer itself. it may not be your vehicle's harness. also, check with an appropriate trailer dealer, both your 4 way and the trailer harness.

Jun 10, 2009 | 1998 Ford Expedition

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