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Old 03-28-2020, 03:31 PM   #1
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Trailer wiring

Ok, I hit a snag! or a mess, or something in-between!

I am trying to install a brake controller on my 2004 HR Vacationer with a W-22 chassis. I learned (on here) that WH/Monaco did not install a brake wire until '06 or after but after much searching, I found some PO had installed a brake wire back to the hitch. Unfortunately, the wiring has been done over and over and is more than a mess and I need to start from scratch to get things wired correctly. A truck type 7 pin connector has been installed but there are at least 4 wires cut and loose and others not following std wire colors.

I am trying to start from the 6 pin flat connector (I 'assume' it is part of workhorse chassis installation) but I can not find a wiring diagram anywhere that would give me an idea of what wire is which. I guess I can try turning on various lights/brakes/turn signals but I'm alone and it would be a lot easier to start with knowing what to test for. I'll post some pictures so you will know what flat connector I am talking about. It also appears that only 5 of the 6 incoming pins are active (wire missing on incoming side). It does have a 4 wire to 2 wire controller to get the right signals to trailer turn signals. So maybe this has all been wired after market? Hope not . .

Anybody have any idea what wires I am working with from that 6 pin connector?

Thanks
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Old 03-28-2020, 04:52 PM   #2
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Steve43-

See if this helps you.

If it doesn't, then let me know. I can dig deeper.
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File Type: pdf 16621904_B_HARNESS TLGT IN.pdf (67.0 KB, 10 views)
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Old 03-28-2020, 05:03 PM   #3
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I recommend using a 12v test light, then you know for certain what the signals are. I used a broom to hold the brake pedal down while i checked the wires at back. Be sure you have a good frame to frame connection from coach thru the connector to toad frame.
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Old 03-28-2020, 10:39 PM   #4
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I turn on the emergency flashers as thats also the brake light circuit when testing when on my own.
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Old 03-29-2020, 11:30 AM   #5
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This is the wiring diagram for the 7 pin connector:
https://www.google.com/search?q=barg...SJ7yEK2-U9QEM:

Like was said above you will have to pin out the wiring on your RV with a test light so you can install the wires in the correct position.
Note the center pin in the plugs. This is often used for back up lights. (Optional)
Lynn
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Old 03-29-2020, 05:00 PM   #6
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Thanks for all the replies. Went back to the storage shed resolved to straighten out the mess. Turns out that either Workhorse or Monaco added a 6 pin flat connector that fed directly to the trailer connector. Probably originally a 6 pin trailer connector at the hitch. Over time it was changed to a std 7 pin and jury rigged wiring. So although the flat pins in the diagram that was sent to me by Mark was interesting, it did not show the trailer flat pin connection. Anyway, after much testing/running back and front!, this is what I found - hopefully helpful to someone.

Flat 6-pin is labeled A-F.

Pin A - GRND. White wire
Pin B - AP (12v accessory Power). Black wire (incoming wire is not there so no 12v available at this pin) not sure if it was ever there (clipped right at the incoming connector) but I couldn't find a wire in the incoming flex tubing that might be the missing wire. Since there is no wiring diagram, I can't be sure if there ever was suppose to be one there.
Pin C - LT (Left Turn). Red wire (not used - cut off in outgoing flex tubing). The LT/Stop wire is provided by a yellow wire from 4 to 2 wire converter
Pin D - RT (Right Turn). Brown wire (not used - cut off in outgoing flex tubing) The RT/Stop wire is provided by a brown wire from 4 to 2 wire converter
Pin E - Rev (Reverse). Yellow wire
Pin F - Tail (parking lights/headlights). Brown wire

Of these 6 pins, only three are in active use going to the 7 pin trailer connection: (Pin A, Grnd; Pin E, Rev; and Pin F, Tail). Pin B is connected (AP, 12v) but since there is no incoming wire to the six pin connector, it doesn’t do anything.

As stated above, not sure who provided the 6 pin flat connector (Workhorse or Monaco, or ?) but neither appears to provide any wiring diagram for this setup.

Thanks again for the assistance and hope this helps someone in the future.

Steve
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Old 03-29-2020, 06:20 PM   #7
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Steve-

The diagram attached to my post #2 shows a flat connector, with exactly the pinout you list, in the lower right-hand corner.

Glad you got things straightened out!
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Old 03-30-2020, 05:57 AM   #8
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The 6 pin connector you found may have been related to what was supplied on GM cars which came from the factory with a trailer towing package.
In my opinion they were pretty well useless as they never matched the wiring plugs on a trailer.
Lynn
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