Wiring Van for 7pin trailer plug
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Junior User
Joined: Mar 2003
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Wiring Van for 7pin trailer plug
My E350 Superduty was only wired to the rear for 4 pin trailer plug, (yes, I did verify that!) but had the relays in for other parts (Batt feed, Reverse lights) and plug under dash for brake controller.
Since the remaining three wires were not run to the back, I checked the wiring diagram and ran the three back myself. From the brake controller plug under the dash I ran the blue wire back, from a mystery (at least at first) plug under the hood I found the Batt feed and ran it back (more on that in a minute) from the relay itself, I ran the reverse lights feed back.
Have added pics to my gallery.
The mystery plug turns out to be part of the PTO (power take off) wiring which also uses the Batt fees normally used for the trailer. I do not have the PTO option on my transmission ... ah well.
Bought an aftermarket 7 pin plug which has a standard 4 pin plug to plug into the existing van plug, and 3 wires for the remaining parts, batt feed, reverse lights and electric brakes.
The backup light circut is helpfull, I have mounted on the rear bumper (below) two additional backup lights as well as on the back of the trailer a high mounted backup light. The more one can see the better!
Since the remaining three wires were not run to the back, I checked the wiring diagram and ran the three back myself. From the brake controller plug under the dash I ran the blue wire back, from a mystery (at least at first) plug under the hood I found the Batt feed and ran it back (more on that in a minute) from the relay itself, I ran the reverse lights feed back.
Have added pics to my gallery.
The mystery plug turns out to be part of the PTO (power take off) wiring which also uses the Batt fees normally used for the trailer. I do not have the PTO option on my transmission ... ah well.
Bought an aftermarket 7 pin plug which has a standard 4 pin plug to plug into the existing van plug, and 3 wires for the remaining parts, batt feed, reverse lights and electric brakes.
The backup light circut is helpfull, I have mounted on the rear bumper (below) two additional backup lights as well as on the back of the trailer a high mounted backup light. The more one can see the better!
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Junior User
Joined: Mar 2003
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In my 2000 E150 with the towing package the wires ran back to a plug near the 4 pin cable plug (above drivers side rear axel) which if it existed in the new van would be C422. In this 2005 E350 the tow package was not installed all the way to the rear, it stops in the C110 connecter on the inside of the drivers side frame near the back of the engine/front of the transmission.
Since that C110 connection is not as easy to get to I did the connections the other way (see above). I hated the idea of breaking into the cable bundle underneath the car to pull the wires out but it could be done with care to protect the wire bundle integrety and keep moisture out.
Since my van was 12 passenger it only got wired to the rear for a class 1 hitch (the step bumper). The wiring diagrams note that it needed to be wired for class II for the three extra wires to be found in the back at C422 connecter. Ah well.. life can't be too easy!
Since that C110 connection is not as easy to get to I did the connections the other way (see above). I hated the idea of breaking into the cable bundle underneath the car to pull the wires out but it could be done with care to protect the wire bundle integrety and keep moisture out.
Since my van was 12 passenger it only got wired to the rear for a class 1 hitch (the step bumper). The wiring diagrams note that it needed to be wired for class II for the three extra wires to be found in the back at C422 connecter. Ah well.. life can't be too easy!
Senior User
Joined: Dec 2004
Posts: 263
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From: Georgia
I did this several months ago at C110 on my 2004 E350 and have documented much of the work here (in the van forum). There were no issues with breaking integrity on that connector and the work didn't seem that complicated to me. I did not break into the cable bundle at all. I ran all three wires from the factory designated connector pins through the connector housing itself so anyone with a manual can work on it if need be. The connector is waterproof with rubber seal that fit around my added wiring just like if the factory wires were there. It's all very neat and tidy looking.
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