wire harness over rear axle?

[bork]

I see there is a main harness that splits into three short pigtails. One has a 4 hole fem plug, other two have 2 hole fem plugs, & one of those is plugged in & being used. So what do they all do? do I use the 4 hole plug only,if I use brake controller? or do I use all 3 plugs or 2? Excuse my blondeness or laziness to get out test lamp. Hopefully someone brighter knows without even having to think.
Thanks ahead of time, Bruce

[stroked_van]

C'mon Bork!!!!!!!
I answered that in the p.m.'s!!!!!! [img]/ubbthreads/images/graemlins/tongue.gif[/img]

lol.....seriously though:
One of the 2 unused connectors will have the brake control wire in it.
Am in Houston right now and do not have a meter with me or I would check and see EXACTLY which wire it is. [img]/ubbthreads/images/graemlins/grin.gif[/img]

[MADVAN]

If i remember.
One is used for class 1 and combination of the 2 connectors are used for class 2. Class 2 trailer is the big round one that has trailer charge and reverse light.

Bill

[beaker]

There are two "four-pin" connectors at the rear axle, but one contains only three pins in it. The one with the four pins and the larger gauge wire has the brake control wire in it. It should either be dark blue or black, 10 gauge.

If you don't already have a 7-way connector on your back bumper, it's possible that you do not have the wiring for the brake controller. All E-series come standard with the 4-way flat connector, which uses only one four-pin connector at the rear axle. If your van has the trailer prep wiring, there should be (2) four-pin connectors with a total of seven wires (one pin missing).

If you have the standard wiring harness, the trailer brake wiring ends at the big honking connector on the left side of the transmission. To convert to a factory 7-way, you would need to buy a new wiring harness from there back. The front one costs $190 (it runs to the rear axle), and the Ford 7-way connector would cost an additional $90 (but once in a blue moon show up on e-bay). If you are not in a land of salt and snow where those factory connectors pay for themselves, you might be better off just bringing your own wires all the way back from under the dash.

[bork]

[ QUOTE ]
C'mon Bork!!!!!!!
I answered that in the p.m.'s!!!!!! [img]/ubbthreads/images/graemlins/tongue.gif[/img]

lol.....seriously though:
One of the 2 unused connectors will have the brake control wire in it.
Am in Houston right now and do not have a meter with me or I would check and see EXACTLY which wire it is. [img]/ubbthreads/images/graemlins/grin.gif[/img]

[/ QUOTE ]
DOH! your right & I saved the PM ! Thanks! Now some of it makes more sense. Did I say some? Why does this 7 pin connector have 7 ? (Left turn, right turn,(both on for brake lights), running lights, ground, & juice to brake magnets.)= 5 ???
Remember to type slow, I'm blonde.

[MADVAN]

Bork
You missed 2. Used for class2
Trailer backup lamps.
Trailer battery charge.

That makes 7 [img]/ubbthreads/images/graemlins/grin.gif[/img]

Bill

[bork]

Now it makes even more sense. I just have a small utility trailer for dirt bikes . Thanks Madvan

[KTD]

[ QUOTE ]
There are two "four-pin" connectors at the rear axle, but one contains only three pins in it. The one with the four pins and the larger gauge wire has the brake control wire in it. It should either be dark blue or black, 10 gauge.

If you don't already have a 7-way connector on your back bumper, it's possible that you do not have the wiring for the brake controller. All E-series come standard with the 4-way flat connector, which uses only one four-pin connector at the rear axle. If your van has the trailer prep wiring, there should be (2) four-pin connectors with a total of seven wires (one pin missing).

If you have the standard wiring harness, the trailer brake wiring ends at the big honking connector on the left side of the transmission. To convert to a factory 7-way, you would need to buy a new wiring harness from there back. The front one costs $190 (it runs to the rear axle), and the Ford 7-way connector would cost an additional $90 (but once in a blue moon show up on e-bay). If you are not in a land of salt and snow where those factory connectors pay for themselves, you might be better off just bringing your own wires all the way back from under the dash.

[/ QUOTE ]

Beaker do you know the part numbers for those wiring harness? I have a 2006 E350

[beaker]

I don't have the rear section part number. It's going to have a 13A576 as the middle numbers. They used to make just one length and fold it back on itself for the shorter vans. Now, presumably for cost reasons, there are separate harnesses for extended and regular vans.

The center section on my 7.3 is a YC2Z-14406-LA according to my receipt, and 1C24-14406-KA according to the label on the harness itself. I'm pretty sure your 6.0 will be different, since the fuel heater/filter/separator sits under the driver's seat, which this harness runs under. Wiring to this filter assembly would logically come from this same harness. This center section comes with fuel lines and the rear brake line all bundled together (they're easy to unbundle if you don't want to change those). You'll need to drop the fuel tank to change it, so this would be a good time to shorten up your in-tank vent tube if you are so inclined.

Just about any Ford trailer harness package works for the under-dash part. It is a rectangular 6-pin pigtail plus the two relays in the relay panel behind the driver's headlight. One relay is the compact rectangular type, the other is full-size square. They are for trailer running lights and for trailer charge.

If you talk to a dealer about the harnesses, the parts listing differentiates the 7-way wiring from the standard 4-way as the "camper package".

Most sane people will just buy an aftermarket set-up and zip-tie the additional wires next to the standard harness. I've spent too many hours toubleshooting trailer wiring problems due to sloppy installs, so it was worth it for me.