1962 mutt ignition concern

1959 - 1978, M151, M151A1, M151A2, Technical questions and discussions, regarding anything related to the M151.
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sawlk349
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1962 mutt ignition concern

Post by sawlk349 » Wed Mar 10, 2021 12:47 pm

Vehicle has 24 volt battery set up but has a 12 volt external ignition coil ? And has no spark and coil secondary tests bad. Any thoughts


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Re: 1962 mutt ignition concern

Post by Rickf » Thu Mar 11, 2021 3:50 am

Definitely not original so would have to see pictures to see what you have. If someone fed 24 volts through a 12 volt coil that would explain the bad coil. How are the wires run? How is the coil wire run into the distributor? How are the wires from the point/module run to the coil? Going to need some pictures. Does it have a 12 volt alternator on it? If it does are you sure the batteries are not set up in parallel instead of series, like they are supposed to be for a 12 volt conversion.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

sawlk349
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Re: 1962 mutt ignition concern

Post by sawlk349 » Thu Mar 11, 2021 6:50 am

Distributor has been changed along with ign coil and was a 12 volt. I am trying to install front wiring harness and what a concern. It is a 1962 m 151 and this is what was in it.
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W. Winget
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Re: 1962 mutt ignition concern

Post by W. Winget » Thu Mar 11, 2021 7:13 am

So do you want to go back to 24V original, or fix what was modified here?

The original has everything within the housing and requires 24V power, sealed wires and in your case plugs would have to be swapped to the military type for the wires.

Plugs are now running between $20-25 each, likley the same for the wires, old distributor is fairly cheap, but a good 24V coil is difficult and expensive.

So if you are not planning on fording , or showing her as an original vehicle, then fixing the modification to continue working is in order, and likely has Ford ignition parts in it. We've only seen one or two civilian distributor equipped MUTT engines in the past few years, these were rare factory equipped units which were likely just used for non-waterproof needs such as a tug, or other piece of equipment.
V/R W. Winget
Looking for 1918 Standard B 'Liberty' truck parts

sawlk349
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Re: 1962 mutt ignition concern

Post by sawlk349 » Thu Mar 11, 2021 7:32 am

It has a generator and external regulator 25 amp I presume. it had one battery installed but now has two properly wired for 24 volt system. Has a Delco 12 volt points and condenser distributor which is incorrect. If I change back to oem dis will this a-2 harness work with new dis ? Thank you.

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Re: 1962 mutt ignition concern

Post by sawlk349 » Thu Mar 11, 2021 7:36 am

Sounds like keeping what is here and running it as it was prior 12 volt. How will this work with the generator though ? as a 12 volt

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Re: 1962 mutt ignition concern

Post by sawlk349 » Thu Mar 11, 2021 8:23 am

and what is the best way to connect the two batteries for 12 volts ?

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Re: 1962 mutt ignition concern

Post by Rickf » Thu Mar 11, 2021 8:45 am

As I said before, we need pictures. I have absolutely no idea what you are working with. That extreme closeup of the distributor told me nothing, all I see is a huge picture of a condenser. Need some normal size pictures of the alternator, the distributor and just the overall wiring and vehicle so we know what it is you are working with.. It sounds to me like it was set up for 12 volt and if you feed 24 volts to it you will fry most of anything 12 volt there. Another thing to check is the light bulbs, are they 12 volt or 24 volt? The conversion may not have progressed that far so that is not a true indicator but if they are 12 volt then it has been converted.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

Rickf
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Re: 1962 mutt ignition concern

Post by Rickf » Thu Mar 11, 2021 8:48 am

sawlk349 wrote:
Thu Mar 11, 2021 8:23 am
and what is the best way to connect the two batteries for 12 volts ?
Positive to positive and negative to negative, from those connections to the vehicle positive and negative. BUT! You need to determine what voltage the vehicle has been set up for first. Jumping ahead here can get real expensive.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

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Re: 1962 mutt ignition concern

Post by W. Winget » Thu Mar 11, 2021 10:48 am

Does the generator have a large nut connecting a foot long (+) large diameter cable to a Large boxed regulator mounted on the left side of the firewall with two large nuts/ cables going into it?
Then it would most likely be a 24V system.
If it has cables that you connect under studs and nuts, then it's likely a 12V generator from a car truck/tractor
Pics will help, and looking at the internet photos of other MUTTs or parts pages can tell you what was supposed to be there.
V/R W. Winget.

PS: you can install a more modern A2 alternator into the A1 wiring harness, you just have to do a little wire swapping to make it happen, as the regulator goes away, it's internal on the later alternators (which look like generators....)
Looking for 1918 Standard B 'Liberty' truck parts

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Re: 1962 mutt ignition concern

Post by sawlk349 » Fri Mar 12, 2021 6:22 pm

It is a 24 volt with a volt ignition system with a 24 volt 25 amp generator. I retained the 12 volt ignition and electric aftermarcket in line fuel pump. I am installing a front wiring harness from a a 1 and it is giving me fits. Thank you for all the help.

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Re: 1962 mutt ignition concern

Post by Rickf » Sat Mar 13, 2021 3:57 am

OK, Lets start from scratch here. That is going to make things a lot easier for those of us that can't see what is going on. So you are going back to stock. That makes diagnosis easy. You mentioned earlier you were using an A2 harness but just here you mention an A1 harness. Considering a new A1 harness is almost 2,000.00 and an A2 harness is about 350.00 new I am going to guess you have the A2 harness. You can connect the 25 amp generator and regulator to the A2 harness but to be honest it will be easier and better to just find a 60 amp military alternator and then it is plug and play. As far as all of the other connections they are all there on the harness except for the #77 circuit which is the oil pressure safety cutoff for the electric fuel pump in the tank. If you want to run that pump you can use the electric wiper wire but you will not have the safety circuit. Most people just go with an A2 mechanical fuel pump on the engine and run the wipers from manifold vacuum. You will need to extend the turn signal wires and blackout light wires but again, this is minor. If you want to do it right get the waterproof military connectors and some military wire to extend the wires without cutting and splicing.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone

sawlk349
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Re: 1962 mutt ignition concern

Post by sawlk349 » Sat Mar 13, 2021 9:15 am

You are correct on A 2 harness. Best way to wire generator with A 2 harness ? Thank you for all the advise.

Rickf
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Re: 1962 mutt ignition concern

Post by Rickf » Sat Mar 13, 2021 3:49 pm

The #5 wire that would normally go to the 60 amp alternator will need to be tied into the "A" terminal of the voltage regulator batter to regulator harness. The #568 wire will be capped off since it is the field wire for the alternator and will not be used and the #57 wire will need to be stowed at the ground point on the fender since this is a ground for the system in addition to the lights. I strongly suggest you do all of this in a manner that is easily reversible so that if and when the generator or regulator goes out you can revert to the 60 amp setup and just buy a 60 amp alternator. That will be much cheaper than repairing a defunct 25 amp system.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone


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