Question about 1989 Ford F 350

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Wiring need wiring diagram 4 trailer 7 wire have O.E.M. plugs

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  • GCBUTT Jun 20, 2008

    I HAVE TRIED TO INSTALL AN ACCESSORY POWER SUPPLY (CIGARETTE LIGHTER) OUTLET FOR MY MOTORHOME.I TOOK THE POWER SUPPLY FROM ONE OF THE LIGHTS AT THE BACK OF THE HOME.I INADVERTENTALLY CROSSED MY WIRES AND HAVE BLOWN THE CIRCUT.I HAVE NOW LOST THE POWER TO 5 OF THE LIGHTS.DO YOU KNOW IF THERE IS AN INLINE FUSE OR A FUSE BOX SOMEWHERE THAT I CAN MAKE THE REPAIR?SEND REPLY TO EMAIL. THANK YOU.

  • Anonymous Jul 23, 2008

    need to color code for the wiring of trailer

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  • Master
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Try this link www.dodgeram.org/tech/mods/electric/trailer_wire.htm

Posted on Jul 10, 2009

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Depends on plug type and number of Pins used.
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Hello Carol, The 7 way is for use with a brake controller and/or a trailer that has electric brakes. The 4 way flat is a basic trailer plug connector.
Connect as follows:
Green wire- Connects to the vehicles right turn wire harness & provides brake light and right turn signal on trailer.

Yellow wire- Connects to vehicles left turn wire & powers brake light & Left turn signal on trailer

White wire- Ground

Brown Wire- Tail/ marker/ license plate lights

The Blue, Red & Purple wires on the 7 way will not be used on the adapter, those are for brakes.

I hope this information is helpful.

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The 2005 trailer tow adapter wire diagrams
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With 4 prong and 3 extra, that will give you what you need for 7 prong for towing RV. If your not too experienced in that area, a mechanic at any trailer place, or hitch installation place or who knows RV wiring, should be able to do it for you in about 1/2 hr. or less. Testing the wires from your truck for what they do as in right , left, stop, running/taillights, etc is about the hardest part, and the 7 prong usually comes with what terminal does what.48e2ffb.jpg

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If you are going from a 4 pin on your trailer to the 7 pin on the truck. You need to go to parts store or a department store (ex Wal Mart) and look in trailer section and find the adapter. Thats what I did. Also Remember if your lights don't work on trailer, check the plug to make sure its tight or check the fuse under your drivers side rear seat for that fuse box.

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Here's one
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Hi there;

Here is the wiring diagram for the trailer wiring for your truck.
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Hope this helps
Farrout!

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1 Answer

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I believe you can look up the manufacturer of the trailer plug kit and find the wiring diagram there. On alot of the trailer plug kits, they have pics and diagrams in the package. The 7 pin plug (truck side) is available with the pig tail set up that plugs directly into the wiring harness for the lights. Then all you would have to worry about is the 2 wires for the electric brakes.

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