M38A1 Wiring

1952 - 1968, M38A1, M170, questions, discussions, regarding anything related to the M38a1 series.
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Don X
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M38A1 Wiring

Post by Don X » Thu Jun 07, 2018 7:49 pm

I need to rewire my M38A1. It still has a 24 volt system but it's not a restoration quality Jeep. I've been looking at wiring harnesses but everything that Walcks, Kaiser Willys, etc. carries is way overkill way expensive for what I'm doing. EZ Wiring has some reasonable kits but I can't tell if they'll work with the 24 volt systems. Can anyone recommend a generic wiring harness that works with 24 volt? Not concerned about water proof qualities. Only that it will work with24 volts.

mdainsd
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Re: M38A1 Wiring

Post by mdainsd » Thu Jun 07, 2018 9:08 pm

Unfortunately, all the end use items, like lights, sensors, switches, generator, regulator and gauges have unique Military style connectors. The non military after market harnesses, do not.

There really is no middle road.

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spillmk1
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Re: M38A1 Wiring

Post by spillmk1 » Fri Jun 08, 2018 3:44 am

The 24v really doesn't have much to do with it. A harness could be built using standard 14, 12, 10, 8 gauge wiring as needed. But like stated above, all the pigtails/connectors on your "stock" items like lights and gauges would have to be clipped and another means of connection found.....plug, soldering, splice, etc...

dpcd67
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Re: M38A1 Wiring

Post by dpcd67 » Fri Jun 08, 2018 8:43 pm

Here is what you should do; pay $850 for a new harness.
OR, buy a new M35 truck harness for $60 and make that work. Remember that all military harness wires are numbered the same.
I am doing that for my M38 now. Not as hard as you might think; take it one wire at a time.
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Don X
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Re: M38A1 Wiring

Post by Don X » Wed Jun 13, 2018 9:46 pm

dpcd67 wrote:
Fri Jun 08, 2018 8:43 pm
Here is what you should do; pay $850 for a new harness.
OR, buy a new M35 truck harness for $60 and make that work. Remember that all military harness wires are numbered the same.
I am doing that for my M38 now. Not as hard as you might think; take it one wire at a time.
I'm not familiar with harnesses. What do you mean they are numbered the same? Also, an M35 is a much larger vehicle. Won't the harness be too long for an A1?


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skyjeep50
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Re: M38A1 Wiring

Post by skyjeep50 » Thu Jun 14, 2018 8:40 am

One of the features of the M Series military vehicles is commonality of parts including wiring circuits and electrical components. The wiring circuits are identified by small aluminum tags embossed with the circuit number. I you don't have the manuals for your M38A1 you can go over to Willys M Jeeps site www.willysmjeeps.com and sign in - in the "Downloads" section there are most of the manuals you need plus extensive technical photos and other info to help you. Included are wiring diagrams. The M35 truck has pretty much the same wiring system as the M38A1 jeep - wires are longer of course - but the circuits #'s will be the same. I rewired my M38 using a custom new military harness and it was pretty easy job. Plug and play. With a M35 harness you'll probably want to identify and keep the ends of the harness intact for easy connection to lights, etc., and just shorten the middle of the circuits. I also have a M38A1 and on occasion have switched electrical items from one vehicle to the other. Makes maintenance and quick repairs easy.
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1 - M38A1

dpcd67
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Re: M38A1 Wiring

Post by dpcd67 » Sat Jun 16, 2018 8:12 am

Yes, what he said; a #17 wire from a tank, truck, or jeep, goes to the head light on all of them.
Of course the truck wires are longer; look at my comment "make it work". You want to save money don't you? That means you have to get involved in the process.
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