Trailer Plug Wiring
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Fleet Mechanic
Joined: Oct 2012
Posts: 1,943
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Trailer Plug Wiring
Okay, so I am finally digging into installing a 7 pin connector and brake controller on my '88 E250. It had a 4 pin that the previous owner told me he had spliced in. I unwrapped the electrical tape and found this
I then started digging under the dash and found this
Now does this mean that at some point this vehicle already had a 7 pin/brake controller and that this is the wiring for it? If so, I should be able to just add the 7 pin and hook up the controller to the existing wiring....correct?
Thanks
I then started digging under the dash and found this
Now does this mean that at some point this vehicle already had a 7 pin/brake controller and that this is the wiring for it? If so, I should be able to just add the 7 pin and hook up the controller to the existing wiring....correct?
Thanks
Cargo Master
Joined: Apr 2010
Posts: 2,405
Likes: 4
Every brake controller I have seen has 4 wires coming off it. That plug looks like a 3-wire to me.
Do you have a volt / ohm meter? With a meter and a little detective work you should be able to figure out what those wires are and where they go. They could be abandoned brake controller wires, and easily brought back to life for your install.
Do you have a volt / ohm meter? With a meter and a little detective work you should be able to figure out what those wires are and where they go. They could be abandoned brake controller wires, and easily brought back to life for your install.
Thread Starter
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Fleet Mechanic
Joined: Oct 2012
Posts: 1,943
Likes: 21
Every brake controller I have seen has 4 wires coming off it. That plug looks like a 3-wire to me.
Do you have a volt / ohm meter? With a meter and a little detective work you should be able to figure out what those wires are and where they go. They could be abandoned brake controller wires, and easily brought back to life for your install.
Do you have a volt / ohm meter? With a meter and a little detective work you should be able to figure out what those wires are and where they go. They could be abandoned brake controller wires, and easily brought back to life for your install.
Thread Starter
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Fleet Mechanic
Joined: Oct 2012
Posts: 1,943
Likes: 21
Thanks. I will dig into it further.
4th Gear
Joined: Mar 2004
Posts: 4
Likes: 0
Sorry to advise that Ford did not make any factory installed wiring on the '88 year models and more specifically the "E" series vans had even less wiring than most trucks. The wiring in your photo has wiring with tracer colors (i.e. red and blue wires with black stripe) that were never part of Ford trailer wiring scheme. I think you may be looking at some wiring installed by previous owner. Your model van normally requires all new hard wiring from front to rear by consumer to install/use a brake controller. Good Luck.
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