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willysmjeeps.com :: View topic - Making a wiring harness from other m series vehicles
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Making a wiring harness from other m series vehicles
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bamaj
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Joined: Sep 22, 2013
Posts: 71

PostPosted: Fri Oct 05, 2018 7:26 pm    Post subject: Making a wiring harness from other m series vehicles Reply with quote

I have read people saying that it is not to big of a task to cut a harness down to size to fit my m38a1 from other m series nos harnesses.
I have also seen people saying that a nos harness has all of the age of an original harness but just hasn't been exposed to the environment and they wont last very long.
My first question would be where can I find a decent harness at a reasonable price? I've looked around on the internet and haven't really found anything that I think would be cheap enough to take a chance on.
My second question is if a nos harness from another vehicle isn't a good choice what options do I have other than just to bite the bullet and shell out the cash for a new correct harness. Thanks Jeff
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Jeff Loosier
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wesk
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PostPosted: Fri Oct 05, 2018 7:49 pm    Post subject: Reply with quote

This is amazing! You posted this question today:

Quote:
Fri Oct 05, 2018 7:26 pm Post subject: Making a wiring harness from other m series vehicles


And a new guy tacked a very similar question on to a parts jeep post today;:


Quote:
Posted: Fri Oct 05, 2018 7:10 pm Post subject: Reply with quote Edit/Delete this post Delete this post View IP address of poster
I already have a '52 a1 that I am restoring but it is missing a lot of parts and the parts jeep appears to have just about everything I need but I am sure the harness is probably toast. I am interested how you made your harness could you explain a little of it to me because I need one. Thanks.


So I'll just repost what I posted 5 minutes ago to his post:

Quote:
try to do a little serious research on the topic.

Just Google: "Willysmjeeps adapting other harnesses to the M38A1"

Then read the many posts on the topic written over the past few years.

Quote:
About 26,700 results (0.58 seconds)
Search Results
Web results
Willys M Jeeps Forums-viewtopic-m38a1 wiring harness
www.willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t...
Dec 29, 2017 - 15 posts - ‎3 authors
1-Just order an aftermarket 12 volt CJ5 harness for a 55-71 CJ5. ... You can adapt a civvy 12V fuel sender to the M38A1 tank but you .... need to visit other on line boards for 1940-1960's classic car & truck restorer's opinions.
Willys M Jeeps Forums-viewtopic-M38A1 Wiring ... 15 posts May 18, 2017
Willys M Jeeps Forums-viewtopic-24 to 12 volt 15 posts Mar 2, 2016
Willys M Jeeps Forums-viewtopic-main wiring harness 11 posts Feb 16, 2014
Willys M Jeeps Forums-viewtopic-Making a 24 volt ... 9 posts Mar 14, 2013
More results from www.willysmjeeps.com
M38A1 12 Volt Wiring Harness - G503 Military Vehicle Message Forums
https://forums.g503.com › ... › M38, M38a1 Modifications
Mar 5, 2012 - 11 posts - ‎6 authors
I am just starting a restoration of a 1960 M38A1. ... Will be doing an M38A1 in 12 volt. ... Otherwise, maybe a CJ-5 harness could be adapted?
Routing for M38A1 harness 3 posts Feb 5, 2017
M38A1 Wiring Harness Build & Info 24 Feb. NEW PIC 15 posts Jan 26, 2011
M38A1 Wiring 5 posts Sep 9, 2009
M38A1 turn signals 15 posts Nov 16, 2006
More results from forums.g503.com



The willysmjeeps posts about this topic are:

http://www.willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=10420&postdays=0&postorder=asc&start=15

http://www.willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=11191

http://www.willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=8701

http://www.willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&t=7790

Just to get started
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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bamaj
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Joined: Sep 22, 2013
Posts: 71

PostPosted: Fri Oct 05, 2018 7:53 pm    Post subject: Reply with quote

Thanks Wes
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Jeff Loosier
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wesk
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PostPosted: Fri Oct 05, 2018 7:58 pm    Post subject: Reply with quote

Simply put:

1: For $800 you can buy a brand new custom made harness (caution here because brand new means assembled date) which may contain some NOS rubber parts from old military surplus stocks which do not last long when they are exposed to the elements.

2: for about $300 you can buy all the actually brand new materials to build your own 24V harness.

3: for about $40 plus freight you can buy a NOS late M series truck harness and adapt it to your jeep. Just make sure the surplus NOS harness has a date on the package newer than 1990 and things should go well for you.

Note that option 1 assumes you are mechanically inclined and can follow written directions. Option 2 & 3 assume you are familiar with electrical work and wiring diagrams and are mechanically inclined.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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bamaj
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Joined: Sep 22, 2013
Posts: 71

PostPosted: Fri Oct 05, 2018 8:07 pm    Post subject: Reply with quote

I feel comfortable doing either and would certainly go for the $40.00 harness to at least give it a try. I just haven't been able to find a deal like that. All the ones I have found are in the $300.00 range.
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Jeff Loosier
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4x4M38
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Joined: May 30, 2014
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PostPosted: Sat Oct 06, 2018 8:39 am    Post subject: Reply with quote

Try eBay Jeff.
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Brian
1950 M38
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4x4M38
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PostPosted: Sat Oct 06, 2018 8:46 am    Post subject: Reply with quote

https://www.ebay.com/itm/M35A1-M35A2-Trucks-WWll-Jeeps-Wiring-Harness-NOS-update-turn-signals-flasher-/183465959286
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Brian
1950 M38
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bamaj
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PostPosted: Sat Oct 06, 2018 6:41 pm    Post subject: Reply with quote

Thanks guys. Guess I didn't look hard enough.
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4x4M38
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PostPosted: Sun Oct 07, 2018 6:27 am    Post subject: Reply with quote

If you want turn signals Saturn Surplus was selling a flatbed trailer harness for
about 30 bucks on eBay. Five wires over 30 feet long, with connectors. Plenty of wire. Use that for your rear harness. There’s plenty of wire to add the extra wire for the second left light used in the turn signal installation.
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Brian
1950 M38
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4x4M38
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PostPosted: Sun Oct 07, 2018 6:35 am    Post subject: Reply with quote

https://www.ebay.com/itm/WIRE-HARNESS-W-DOUGLAS-CON-FOR-PARTS-5EA-WIRES-32-LONG-NSN-2590-00-534-2352-/331767569024
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dpcd67
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PostPosted: Sun Oct 07, 2018 3:58 pm    Post subject: Reply with quote

I explained how to do it on your M38A1 post; read that. Note that it is not just a matter of Cutting it down; you have to make some of the wires too. But all M series wire numbers are the same. The M35 harnesses on eBay are new. Yes you need skill and patience to make an M series harness but it is not really all that hard. Just tedious. I made a complete M38 harness including all the under dash wiring. Works perfectly. I got Douglas connectors from MM to make it look right.
Total cost was $75 but I already had the right crimper.
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M38 23100 June 1951
M37B1 1963
Willys MB 1944
Ford GPW 1942
Dodge WC63 1943
Dodge Power Wagon WM300 1967 (Not Military)
Plymouth Barracuda, 1973, 340 4 barrel (Army staff car) Not.
All ground up restored by me.
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bamaj
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PostPosted: Sun Oct 07, 2018 6:31 pm    Post subject: Reply with quote

Would solder be just as good as a crimp?
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wesk
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PostPosted: Sun Oct 07, 2018 8:32 pm    Post subject: Reply with quote

Soldering will work if the pins you are using are designed for use with solder. Usually crimp style pins are bored small strictly for the insertion of the bare wire of the correct gauge. Solder type pins usually have an additional void or well for the solder. With that in mind it is safe to say if you have access to solder type pins then fine if not you will always run the risk of inadequately securing the wire in the pin.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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dpcd67
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PostPosted: Sun Oct 07, 2018 8:37 pm    Post subject: Reply with quote

You will quickly get tired of soldering instead of crimping. Look on that big on line auction site for a crimper; they are often on there.
_________________
M38 23100 June 1951
M37B1 1963
Willys MB 1944
Ford GPW 1942
Dodge WC63 1943
Dodge Power Wagon WM300 1967 (Not Military)
Plymouth Barracuda, 1973, 340 4 barrel (Army staff car) Not.
All ground up restored by me.
Lots of others over the years.
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wesk
Site Administrator
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Joined: Apr 04, 2005
Posts: 13820
Location: Wisconsin

PostPosted: Sun Oct 07, 2018 8:48 pm    Post subject: Reply with quote

The tool you are looking for is:




These are usually fixed one size only tools.


These can be rebarreled by the owner for different size pins.
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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