7-way Trailer Plug for F-150

Discussion in 'Mechanic and Repair' started by LawnSharks, Jan 10, 2008.

  1. LawnSharks

    LawnSharks LawnSite Senior Member
    Posts: 300

    I just bought an '05 F-150 Super Crew that is factory equipped with a 4-way trailer plug. I need to change it to a 7-way. I went to Northern Tool and bought a 7-way harness that supposedly plugs into the adapter plug that is stock from the factory but my truck does not have the plug-in. How can I splice into the existing 4-way and pick up a line for trailer brakes? Is there a conversion wiring harness that can take it from 4-way to 7?
    Any help would be greatly appreciated.
    Jeff
     
  2. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Posts: 3,503

    You are going to need an electronic brake controller also...I took my truck to an RV/camper dealer and got the entire set up installed/purchased for about 150 bux. Parts were about 70-80 bux and labor was the same, that included running a 7 wire harness from the cab to the rear of the truck

    wayne
     
  3. LawnSharks

    LawnSharks LawnSite Senior Member
    Posts: 300

    Thanks Wayne. I was hoping it was something we could do in the shop. I'll send it over there now.
     
  4. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Posts: 3,503

    You may be able to do it....to be honest I wasnt sure of the operation of the device...how to hook it into the brake and electrical systems ....and when I found the cost of the unit and the amount of the labor....80 bux labor didnt seem to bad.
    I dont mind tackling some jobs but the electrical system and the braking system.....I figured I best let some one that knew what they were doing.........do it lol.

    wayne
     
  5. dgZtrak737

    dgZtrak737 LawnSite Member
    Posts: 120

    This link might help you.
    http://www.marksrv.com/wiring.htm
    If you can do this yourself you will save alot of money. I would also hard wire my brake controller. I have never had any luck with wiring them up through a connector. GOOD LUCK.
    Black Wire to battery + with 20 amp fuse
    White Wire to ground -
    Red wire to stoplight switch
    Blue wire to pig tail
     
  6. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Posts: 3,503

    Thanx for the info dg, I thought it was more to it than that.....not saying that it is that easy but....when I got my system I had nothing to work with, controller or harness and it was70 miles round trip to get the supplies so I let them do it while I was there. I might try to tackle my 2nd truck myself lol

    wayne
     
  7. dgZtrak737

    dgZtrak737 LawnSite Member
    Posts: 120

    I dont blame you there.
     

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