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the simplest way to do this is to go to a tow bar installer shop and buy the harness ( around $25.00 aud)
it is a simple action of pulling a harness plug apart and inserting a piggy back plug in the connection
the wires for the trailer are properly installed and all you have to do is wire the plug connection according to the wiring diagram that came with the plug
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.
Normally all trailers are wired the same. What I think has happend is the new plug has been wired in wrong. The Rv Plugs wiring is differnt than that of a flat four and round six. I would look in the box that you got the plug in a make sure the wires are correct. I can't find a diagram work the wiring but I do know that the brown is the tail lights, red is the brake, yellow is left turn, green is right turn, and the blue wire is the electric brakes. there is also a Aux power I think that is a pink or Bigger gauge red wire.
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.
I have seen once before that the fuse box was bad on a 2003 Dodge 3500. I had power in and nothing out. We had to replace the box. Not cheap! Hope it is simple like a loose connection though. I think I had to pull the inner fender on the drivers side to access the bottom of the fuse box. Pain in the ****, but...
The diagram will do you no good it you do not have amber turn signals on your trailer. What you need is a "black box" that, when wired correctly, interprets the amber turn signal on the truck into a pulsed flash to the red brake lamp on the trailer. If the trailer does not have amber turn signals, it is impossible to wire a harness with a diagram. Sorry.
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