Id like to find some new ford plugs to match the tail light trailer plug my 95 E350 has by the rear bumper.


But I cant even separate the connector yet, or take the cap off of the larger red black blue wires the factory ran for brakes etc. I haven't figured out the trick and have tugged a long time and felt no movement.


Can anyone tell me the name of that ford plug? Or point me in the right direction please?

 

We do alot of trailer work at my shop. Not sure what Fords technical name of the plug is, but I would tell you to just cut the wires at the back of each plug (cut at vehicle harness side), then run new wires to your plug at the bumper. Chances are if the connectors are seized the pins are garbage anyway. Identify Fords wires with a test light by checking one circuit at a time for the lights...ie:turn on park lights look for hot wire, then turn them off turn on left then right signal...identify ground by touching light to known hot wire ie: park lights and then put other end of light to any other wires and if it lights you found a ground. If no ground is present just clean an area on the frame connect wire and run to trailer plug. Once you identify wires run the new harness to your plug. Remember to use connectors with shrink tube on them!!!!!!!!!!

ISO wiring for trailer lights is as follows:
Brown or Black=marker, clearance, or park lights...All the same thing
green= right turn
yellow=left turn
white=ground
Sometimes trailer manufacturers will use a red wire for ground...one example of this is Chronkite trailers starting in 2001 (I was a dealer for many years)

On the brakes
Blue=stop wire
red=charge wire...constant power
white or black=ground

After you wire your truck to ISO standard your trailer may not work right..if so open trailer plug and wire trailer plug to ISO or you can rewire truck plug to match trailer.

When you hook up trailer plugs they are marked inside with colors so when you run a new truck harness use correct color wires for each circuit and then just hook up accordingly.

Again be sure and use connectors with heat shrink tube on them...DONT FORGET to run a solid ground to trailer plug on truck and always ensure ground on trailer...I always recommend a 12 gauge wire for the ground...14 gauge should be fine for lights, again 12 gauge for electric brakes.

Also if the trailer has more than two lights that flash with signal you will need to get a flasher to handle more lights...Napa or Carquest is your best source for this....if not find a truck parts store..

Hope this helps you out!!

 

Some good info there thanks mack guy.

I finally separeted the connectors and the contacts are ok. I decided to reuse the turn and running lights plug since they worked fine and I trust them now that I know the contacts are clean and protected.
The other larger factory blue red black white wires I abandoned because I dont know where they originate and the PO had already run a brake wire.
Only wire I don't have and want still is the 12v to charge the camper battery while the van is running.

I'm layed up for a while now since I sliced my little finger and needed stitches but hope to figure out where those factory trailers wires (top back connector) came from..

 

the blue red and black wires originate under the driver side of dash tucked way up in above emergency brake pedal...they will be tied to harness most likely. I would locate the red and since its a heavier gauge wire and close to the fuse panel i would use that one for constant power to camper....sorry to hear about the finger!!!