Building a wiring harness

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
PVT MacGyver
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Building a wiring harness

Post by PVT MacGyver » Mon Jun 20, 2022 1:41 pm

Hey folks hoping someone can help me out. I’ve got to build a new harness for my M151A1 and I’m looking for the Packard connectors but I don’t want to have to spend $2+ for each connector. Found some on eBay but I have to buy 100 male and 100 female and it would cost me over $200 after tax and shipping
Does anybody have a good source?
By the way I’m ordering wire tags similar to the originals from a company called National Band and Tag Company.
I need MS27144-2 and MS27142-3 I believe.
Thanks.
SPC Trimble, 12T/12Y
1967 M151A1 “Y” cut
Jack of All Trades
Building motorcycles is a lot less expensive than old military vehicles… 😬


Rickf
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Re: Building a wiring harness

Post by Rickf » Mon Jun 20, 2022 2:55 pm

Did a Google search for Military Packard wiring connectors and found this. https://www.federalmilitaryparts.com/pr ... electrical. 100 male connectors for about a buck apiece. You may be able to search that site and find the same deal on the female or close to it and you would be set with some left over to sell. I am also interested because I am converting my A1 over to an A2 harness complete with 60 amp alternator but I want to build a new #77 circuit to incorporate into that harness to keep the electric fuel pump and safety switch. Also want to extend the light wires as needed but want to do it correctly with the proper connectors.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Kurt Lesser
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Re: Building a wiring harness

Post by Kurt Lesser » Mon Jun 20, 2022 3:06 pm

Personally I think you could save yourself a whole lot of work by starting off with an A2 harness and just modifying it to match your A1. The majority of it is the same and only changing the connectors you need will save you considerable dollars.
Kurt Lesser
US Navy, 1969-1975
M996A1 Ambulance w/M101A3 Trailer
M274A2 Mule
M151A1 Mutt w/M416B1 Trailer
M890 Crew cab

PVT MacGyver
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Re: Building a wiring harness

Post by PVT MacGyver » Mon Jun 20, 2022 3:43 pm

Rickf wrote:
Mon Jun 20, 2022 2:55 pm
Did a Google search for Military Packard wiring connectors and found this. https://www.federalmilitaryparts.com/pr ... electrical. 100 male connectors for about a buck apiece. You may be able to search that site and find the same deal on the female or close to it and you would be set with some left over to sell. I am also interested
Thanks. I’ve found similar deals. Was hoping to find a deal on complete male/female connection for about $1. I’ll probably have to do that unless I find an A2 harness for cheaper. I’d definitely be willing to sell you any extras.
SPC Trimble, 12T/12Y
1967 M151A1 “Y” cut
Jack of All Trades
Building motorcycles is a lot less expensive than old military vehicles… 😬

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Re: Building a wiring harness

Post by PVT MacGyver » Mon Jun 20, 2022 3:47 pm

Kurt Lesser wrote:
Mon Jun 20, 2022 3:06 pm
Personally I think you could save yourself a whole lot of work by starting off with an A2 harness and just modifying it to match your A1. The majority of it is the same and only changing the connectors you need will save you considerable dollars.
That was my original plan but I haven’t actually had any luck finding an A2 harness. I can find a rear harness for an A2 but not the front.
SPC Trimble, 12T/12Y
1967 M151A1 “Y” cut
Jack of All Trades
Building motorcycles is a lot less expensive than old military vehicles… 😬

hambone
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Re: Building a wiring harness

Post by hambone » Mon Jun 20, 2022 4:46 pm

PVT MacGyver wrote:
Mon Jun 20, 2022 3:47 pm
Kurt Lesser wrote:
Mon Jun 20, 2022 3:06 pm
Personally I think you could save yourself a whole lot of work by starting off with an A2 harness and just modifying it to match your A1. The majority of it is the same and only changing the connectors you need will save you considerable dollars.
That was my original plan but I haven’t actually had any luck finding an A2 harness. I can find a rear harness for an A2 but not the front.
Red River Parts has A2 wiring harness for $130, they have an Ebay store.

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Re: Building a wiring harness

Post by PVT MacGyver » Mon Jun 20, 2022 5:23 pm

hambone wrote:
Mon Jun 20, 2022 4:46 pm
PVT MacGyver wrote:
Mon Jun 20, 2022 3:47 pm
Kurt Lesser wrote:
Mon Jun 20, 2022 3:06 pm
Personally I think you could save yourself a whole lot of work by starting off with an A2 harness and just modifying it to match your A1. The majority of it is the same and only changing the connectors you need will save you considerable dollars.
That was my original plan but I haven’t actually had any luck finding an A2 harness. I can find a rear harness for an A2 but not the front.
Red River Parts has A2 wiring harness for $130, they have an Ebay store.
Awesome! Thank you. Can an A2 rear harness be modified for an A1 though? I need front and rear harnesses.
Also, how would I have to modify the A2 harness for the 25 amp charging system?
SPC Trimble, 12T/12Y
1967 M151A1 “Y” cut
Jack of All Trades
Building motorcycles is a lot less expensive than old military vehicles… 😬

hambone
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Re: Building a wiring harness

Post by hambone » Tue Jun 21, 2022 5:44 am

The rear harness will work, it won't have the fuel pump wire and will have an extra b/o light wire on the drivers side.

As far as the generator, a 60A alternator would be an easy swap, but if you don't want to invest in a 60A, this can be done. On the driver’s side under the hood part of the harness you have three wires that hook to the alternator. These leads are number 3, 5 and number 568. #3 is a ground wire, #5 is the "ammeter or shunt to starter terminal block or battery connection" and #568 is the "alternator field from ignition switch". You will want to put these wires on a generator Mutt is as follows:
#3 ground to somewhere on the body.
#5 connect it to the lead coming out of the regulator cannon plug fitting.(you will have two cannon plugs coming out of the regulator, one goes direct to the generator and the other has one smaller wire. you connect this wire to #5).
#568, do nothing with it. Let in hang there unconnected.
Also, behind the dash next to the instrument panel on your generator powered M151 you have three circuit breakers. You will only use two of them. One of them put the two #25 wires and another put the two #27 wires. This should complete your wiring behind the dash.

Rickf
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Re: Building a wiring harness

Post by Rickf » Tue Jun 21, 2022 6:23 am

Now hold on a minute. There are three circuit breakers on an A1 because you have an extra circuit that an A2 does not have, the fuel pump circuit, #77. I am running out to do some errands but I will get into the specifics when I get back.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

hambone
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Re: Building a wiring harness

Post by hambone » Tue Jun 21, 2022 7:18 am

Forgot to mention to use the wiper motor circuit for the fuel pump, or you can build a #77 circuit to utilize your A1 pressure switch.

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Re: Building a wiring harness

Post by PVT MacGyver » Tue Jun 21, 2022 10:23 am

hambone wrote:
Tue Jun 21, 2022 5:44 am
The rear harness will work, it won't have the fuel pump wire and will have an extra b/o light wire on the drivers side. …
Thanks. I’ve already got to replace my voltage regulator, moisture got into it and the contacts are fused, so converting to a 60 amp is just not in the budget.
I’m not worried about the fuel pump as the one in the tank went bad and I put one in line in the engine bay. I’m also running an A2 windshield so it will just plug and play. I will have to put together a circuit for the oil pressure switch though.
SPC Trimble, 12T/12Y
1967 M151A1 “Y” cut
Jack of All Trades
Building motorcycles is a lot less expensive than old military vehicles… 😬

hambone
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Re: Building a wiring harness

Post by hambone » Tue Jun 21, 2022 11:09 am

If you're not using the in-tank fuel pump and have an A2 wind shield, just convert to a $20 manual fuel pump, bolts on where your vacuum pump is/was.

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Re: Building a wiring harness

Post by PVT MacGyver » Tue Jun 21, 2022 12:05 pm

hambone wrote:
Tue Jun 21, 2022 11:09 am
If you're not using the in-tank fuel pump and have an A2 wind shield, just convert to a $20 manual fuel pump, bolts on where your vacuum pump is/was.
Probably will. Still planning my build and buying parts. Another thing I forgot about, I’ve got a heater I’m going to have to figure out.
SPC Trimble, 12T/12Y
1967 M151A1 “Y” cut
Jack of All Trades
Building motorcycles is a lot less expensive than old military vehicles… 😬

Rickf
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Re: Building a wiring harness

Post by Rickf » Tue Jun 21, 2022 1:41 pm

If you are not going to run the in tank pump then you do not need the oil pump safety switch or any of the #77 circuit. The oil pressure sender is a different unit on the other side of the oil filter housing.
And you do know that the 60 amp alternator already has the regulator built in right? It does not use an external regulator.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

PVT MacGyver
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Re: Building a wiring harness

Post by PVT MacGyver » Tue Jun 21, 2022 3:11 pm

Rickf wrote:
Tue Jun 21, 2022 1:41 pm
And you do know that the 60 amp alternator already has the regulator built in right? It does not use an external regulator.
Yes, I just don’t have the money to spend to buy a 60 amp and the pulley at the moment. If you know where I can get a 60 amp generator for about the same as a 25 amp regulator, I would happily buy it. The cheapest I’ve seen though was $500.
SPC Trimble, 12T/12Y
1967 M151A1 “Y” cut
Jack of All Trades
Building motorcycles is a lot less expensive than old military vehicles… 😬


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