WC 12 Wiring Harness Details

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17thAirborne
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WC 12 Wiring Harness Details

Post by 17thAirborne » Tue Oct 31, 2017 10:34 am

I would like to build my own wiring harness for my WC12 project. There are two things I do not like about the ones being sold; expensive and wrapped in electrical tape. I think the original ones were so wrapped, but I would rather use the loom. It looks better and facilitates individual replacement better.

1. Does anyone have any advice to offer?
2. Does anyone have anything which details the lengths of the individual parts, or do I have to lay them out to measure?
3. I suspect most is 14 gauge, but some are thicker. Anyone have any knowledge on some of the other gauges such as the generator runs etc?

Thanks much
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Oz

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Re: WC 12 Wiring Harness Details

Post by zepher11 » Tue Oct 31, 2017 11:50 am

Not sure on wire sizes, but your diagram looks like it is for a later truck. I believe the WC12 (T211 Series) have the civilian gauges. Therefore, there would be two wires running to the fuel sending unit from the rectangle fuel gauge. As they say: ask me how I know... T215 Series trucks have the round "military gauges" that only require a single wire to the fuel sending unit.
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Re: WC 12 Wiring Harness Details

Post by 17thAirborne » Tue Oct 31, 2017 1:00 pm

Zeph, That's nice to know, thanks. The TM that I have shows pics of the cab with the late style gauges in the front of the manual, so your comment makes sense.
Oz

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Re: WC 12 Wiring Harness Details

Post by cjv-35 » Wed Nov 01, 2017 7:44 am

I would say the wire gauge size for the Generator to Regulator and Regulator to Ammeter would be the same as for an MB/GPW. The Arm post on the Generator to the ARM connection on the regulator is 12 gauge. The FLD post on the generator to the FLD connection on the Regulator is 14 gauge. The Bat post on the Regulator to the connection back of the Ammeter is 12 gauge.

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Re: WC 12 Wiring Harness Details

Post by 17thAirborne » Wed Nov 01, 2017 1:47 pm

excellent, thank you
Oz

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Re: WC 12 Wiring Harness Details

Post by zepher11 » Wed Nov 01, 2017 6:18 pm

This is for the WC12:
WC 12 Wiring Diagram.JPG
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Re: WC 12 Wiring Harness Details

Post by 17thAirborne » Wed Nov 01, 2017 6:30 pm

Zeph,
Thanks for posting that. It looks identical with the exception of the dbl fuel wire. I dug through the 3/4 ton TM 9-1808A and found the colors of the wires to be almost an identical match with the Wc 12 diagram. The nice thing is It posts the wire gauge and the number and colors of traces for nearly everything. I will build a spreadsheet with my findings and provide a gross estimate of the amount of wire needed for each run so I can order in bulk. Getting the length close will be a matter of running each wire along its route from origin to destination. I won't be able to do that for a while, but I can stock my wire and loom and buy junctions and connectors.
I suspect I can build the harness one wire at a time and then run through the loom once all of the common run locations are established. I just hate paying 900 bucks for wire and then see it all wrapped up in that ugly tape :shock:
Oz

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Re: WC 12 Wiring Harness Details

Post by zepher11 » Thu Nov 02, 2017 4:50 pm

Have you spoke to Vintage Wiring? I know they try to duplicate originality. I had them complete the radio suppression wiring for my WC16 Command Car. It was identical to the original. Of course, it is the most expensive WWII wiring harness made. $900...I wish. :shock:

However, I would think they would use whatever covering that was used on the original WC12 T211 series trucks. I doubt they would use only black electrical tape if it was not original.

Just an idea.
Zeph

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Re: WC 12 Wiring Harness Details

Post by 17thAirborne » Thu Nov 02, 2017 5:43 pm

zepher11 wrote:
Thu Nov 02, 2017 4:50 pm
Have you spoke to Vintage Wiring? I know they try to duplicate originality. I had them complete the radio suppression wiring for my WC16 Command Car. It was identical to the original. Of course, it is the most expensive WWII wiring harness made. $900...I wish. :shock:

However, I would think they would use whatever covering that was used on the original WC12 T211 series trucks. I doubt they would use only black electrical tape if it was not original.

Just an idea.
I think the black tape is how it was originally wrapped. I just think it looks ugly. Its like the concern with using silver paint for the engine. Looks like shhyte. I am going with the gray like you did, and then use the loom in stead of the tape wrap. I priced wire in bulk, will cost about $320 for all colors and gauges, about 50 for loom and then perhaps $100 for miss. A bit more than 1/2 to save for other parts. I'll have a good bit left for other later projects too.
Oz

Feb 43 GPW 98532 USA 20206257
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Re: WC 12 Wiring Harness Details

Post by zepher11 » Thu Nov 02, 2017 5:53 pm

17thAirborne wrote:
Thu Nov 02, 2017 5:43 pm
I think the black tape is how it was originally wrapped. I just think it looks ugly. Its like the concern with using silver paint for the engine. Looks like shhyte. I am going with the gray like you did, and then use the loom in stead of the tape wrap. I priced wire in bulk, will cost about $320 for all colors and gauges, about 50 for loom and then perhaps $100 for miss. A bit more than 1/2 to save for other parts. I'll have a good bit left for other later projects too.
Ahhh...gotcha. I totally understand. I don't like the silver! :lol:

Looking forward to the report on the wiring harness construction when you get there.
Zeph

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Re: WC 12 Wiring Harness Details

Post by 17thAirborne » Sat Nov 04, 2017 6:15 am

Here is the 3/4 Ton TM extract which details the matching colors and gauges. The table posted below uses the assumption that the 1/2 ton wiring gauges are the same. Both are 6v systems with only minor differences in the systems. I have left the length column blank and will fill that in as I receive measurements from others, or take them myself.

I have a tendency for lyxdexia, so if anyone sees any errors in the transcription of the table, please let me know and I'll update it with a change.
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Oz

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Re: WC 12 Wiring Harness Details

Post by 17thAirborne » Sat Nov 04, 2017 8:38 am

Question: the gauge of wire to the headlights are 14 and 12. Which Is for the high beam?
Oz

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Re: WC 12 Wiring Harness Details

Post by WP1 » Sat Nov 04, 2017 6:38 pm

As far as engine colors you mentioned, gray is correct for engines that went into production line trucks, replacement engines were painted silver

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Re: WC 12 Wiring Harness Details

Post by 17thAirborne » Sat Nov 04, 2017 6:51 pm

WP1 wrote:
Sat Nov 04, 2017 6:38 pm
As far as engine colors you mentioned, gray is correct for engines that went into production line trucks, replacement engines were painted silver
That is interesting as my engine is an Aug 44 replacement and it has silver under the grime. Can you post your reference for the gray to assist the general research :)
Oz

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Re: WC 12 Wiring Harness Details

Post by zepher11 » Sat Nov 04, 2017 8:53 pm

Your're putting together some nice work there Oz. Some great wiring reference detail.

On the engine color, at least for the half-tons, for some reason I was certain that the engines were silver. Seems like I saw some reference at one time. I'll have to see if I can find anything about that as I am now curious.
Zeph

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