7 pin wiring harness problem
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7 pin wiring harness problem
My 09 screw, Lariat has a problem with the 7 pin harness. The 7 pins, I believe, are made up of, running lights, left, right, back up, brakes and a 12 volt supply to charge the break away battery as well as a ground. Everything on mine works except the 12 V supply. I've tested the coupler with a simulator that plugs into the receptical and the 12v fails to light up. Tried with both the truck off and running. When I test a 06 F150, everything works as expected. Anyone have any ideas? I believe the fuses are OK, but not positive what one would be controling the 12v supply. Will be taking it in for the problem but am hoping to have an idea before doing that so I can argue if they claim all is normal. Thanks all.
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I also have question about my 7 pin harness. I have trailer internal lighting and have no power to these lights inside and cant figure out what im doing wrong. I used this site to make sure i was testing the right connections. Dont know if it's any help to your issue.
How to Wire your Car or Truck for Trailer Lights
How to Wire your Car or Truck for Trailer Lights
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Thanks
Ohboy44
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Junior User
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Oh thats what that stuff was for that they could not tell me what it was for when I bought my truck. Why would it not come installed????
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thats exactly what happened to me so i just stashed it up an forgot about it. no idea why its not on there in first place.
Junior User
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I think it's one of those cost cutting measures .. just have the customer install it!
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From: altoona
or they hope you lose it and have to come back and buy another one ...just like that funnie plastic funnel the dealer didn't know what it was for ...did a little reading it for filling gas with a gas can
Mountain Pass
Joined: Feb 2007
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From: Sandy, OR
I had the bag of trailer-related wiring in my glove box, too. From an earlier post I thought it was only necessary for installation of an aftermarket brake controller. But I just plugged my relay and fuse into positions 9 and 21 as mentioned above.
Strange that these weren't already installed. I assume that without the 30 amp fuse, the power lead probably wasn't charging my trailer batteries, either.
Mountain Pass
Joined: Aug 2009
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On delivery the salesman did a great job of showing off every detail,
(I thought the presentation was a bit of overkill...)
including "that funnie plastic funnel" to the point when he was showing the wife how & when to use it he scratched the paint with his fingernail...He felt horrible, the dealership buffed it out on it's first service,
now it's just a funny story
Oh and thanx guyz for the tip on that wiring harness that came with the truck (he didn't mention that)
New User
Joined: Jun 2010
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I know this is an older thread but it was the answer I needed. I bought my 09 screw used and did not get the bag-o-parts for the trailer lights to work. Anyone know the part # of the bag. Is the relay and fuse the same as the others in the power distribution box? How many amps is the fuse? Thanks. Dan
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Hotrod,
I'll have to look at the parts bag next time Im at my truck and post the number for you.
Does any one know if I can install the fuse and relay now so I won't lose it even if I don't plan to tow for some time? Or will I just burn up something electronically by having it installed and not using it.
I'll have to look at the parts bag next time Im at my truck and post the number for you.
Does any one know if I can install the fuse and relay now so I won't lose it even if I don't plan to tow for some time? Or will I just burn up something electronically by having it installed and not using it.