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2007+ Expedition & Navigator 2007, 2008, 2009 and 2010 Ford Expedition and Lincoln Navigator

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Old 10-22-2007, 06:16 PM
72soa 72soa is offline
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blown fuse

We have a 2007 expedition el. I got the tow package because I tow with it. I have three trailers that I tow with the truck. The small trailer and boat trailer use a 4 pin plug. My tandem axle trailer I use to haul my IH scout 4x4 uses a 7 pin trailer. I noticed my lights were not working on the big trailer and I was not getting power to the turn signals and brake lights on the 7 pin plug on the truck. I get power for running lights. In any event I look at the fuses and find a blown 25 amp fuse that controls the turn/brake lights on the 7 pin plug. I am going to replace the fuse and see what happens but any ideas on what could cause the fuse to blow would help a lot. Do you all think I have a problem with the trailer wiring? If so is it a ground problem. I need some help. BTW I do not have a brake controller yet hooked up.
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Old 10-22-2007, 09:44 PM
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fireman28 fireman28 is offline
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I would start with the trailer wiring. You can check your ground on the ball as-well. You may need to grease it depending on your trailer. I would also take a look at the plug on the truck and make sure that all of the wires are secure into the back. If you are looking for a good controller I just bought a Tekonsha P3 and it works like a champ.
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Old 10-23-2007, 04:23 PM
07EXPYEL 07EXPYEL is offline
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Assuming you have the heavy duty tow package, the trailer plug wiring has its own isolated relay isolated circuit and fuse protection. This is a very nice feature as you just found out that you only blew a fuse on the the trailer lights and didn't loose all your turn signals on your vehicle. Look at the wiring diagram that is with your brake wring pig-tail (check by your tire tools & jack) for the relay & fuse info. You should not rely on the trailer ball for a ground. Use a multimeter to check for shorts to ground on the trailer wiring.
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Old 10-23-2007, 04:23 PM
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2006, blown, blows, diesel, f150, f250, ford, fuse, fuses, lights, navigator, problem, tow, trailer, wiring

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