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Private
Join Date: Nov 2009
Location: franksville wisconsin
Posts: 7
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24volt to 12volt
Has anyone for any good reason converted their 24volt system to 12?
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General
Join Date: Feb 2005
Location: Warsaw, Indiana
Posts: 576
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I have not done it with any of our trucks because we find the 24 volt systems to be very reliable. With 24 volts, it takes less amperage to do the same work, so less strain on everything. All parts are available, so no problem there. It is my thought that most conversions are done because someone is uncomfortable with the 24 volt system, mainly because they think there is some kind of mystery about it. They do not want to risk having problems they think they cannot fix with the knowledge they have from working in 12 volt systems. The work and expense of it is just not worth it to us.
Regards Marti
Warsaw, Indiana
3 M-880 Pickups
2 M-200 Trailers
3 M-105 Trailers
2 M35A2 Deuces
1 M-139 5 Ton Bridge Truck
1 M-543A2 5 Ton Wrecker
2 M-51A2 5 Ton Dump Trucks
1 M-52A2 5 Ton Tractor
3 M-135/ M-211 Deuces
1 IHC T-9 SeaBees Dozer
1 M-313 Shop Van
1 M-689 Shelter Dolly Set
1 M-715 1964 Jeep
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4 Star General
Join Date: Dec 2007
Location: Sennett, NY
Posts: 1,027
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The amount of work involved and the pros and cons change depending on which specific model or vehicle family you are asking about. CUCVs are the trucks most likely to be converted to 12V. Which model are you asking about?
Perhaps a thread title change stating the model will get you better responses. Also, there's a lot of info available through the "SEARCH" feature.
Lance
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Private
Join Date: Nov 2009
Location: franksville wisconsin
Posts: 7
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M35a2
It is a comfort level. Also a desire to use 12volt equipment with it. How can I jump start the system with a 12 volt vehicle?????
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Sergeant
Join Date: Jan 2009
Location: Eureka, Mo
Posts: 97
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connect to each batt individualy takes 2 power sorces though .
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Private
Join Date: Nov 2009
Location: franksville wisconsin
Posts: 7
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How reliable are they starting in the winter months in cold weather. Mine does have a manifold heater
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General
Join Date: Mar 2009
Location: Wilton, NH
Posts: 527
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If you're worried about winter starting, going from a 24V to a 12V system is flat out the wrong thing to do. You'll need a much bigger 12V battery, and more copper in the wires between battery and starter to crank over the engine when it's cold. Not to mention finding what would be an odd-ball starter wound for 12V operation for this engine. Stick with 24V systems; keep your system charged when not using the truck (two 12V chargers, a 24V charger, or better still run the truck once every couple weeks and keep the system charged). Use a 24-to-12V power converter to run accessories that you want.
-Carl
1971 M35A2 WO/W
1971 M35A2C W/W
MEP-003A
MEP-017A
Last edited by Carl_in_NH; 11-09-2009 at 14:57..
Reason: Can't type
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The Following User Says Thank You to Carl_in_NH For This Useful Post:
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4 Star General
Join Date: Jan 2009
Location: Columbia Falls Maine
Posts: 1,392
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1970 M35a2w/w
Bobbed by beaubeau
M105a2
DJ
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Corporal
Join Date: Nov 2008
Location: Seattle / Blaine
Posts: 49
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Both my Unimogs and my M656 are 24 volts. I use a little 24V/12V converter for things like my laptop computer, GPS, and stereo.
I needed a jump start once on one of my Unimogs. We just put the 12V jump to one battery for a few minutes, then to the other battery. We removed the cables when starting. We were very careful about grounds and connections, and it worked fine.
As far as cold starting, it doesn't get into single digits very often here in Seattle or Blaine. The coldest I've started is about eight degrees. Instead of starting in one second, the engines took about three seconds. The 24v starter really spins the engine.
1969 M656
1977 416.163
1978 416.115
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Sergeant Major
Join Date: Oct 2008
Location: bostwick, GA.
Posts: 135
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I converted my deuce to 12 volt. I converted it because everything that I use the truck for needs 12 volt power. I have several civi trailers and an RV/toyhauler that I pull with my truck. Not to mention all of my creature features that I have installed. It only cost me 350.00 to do the complete conversion which is super easy to do. 12 volt starters for these trucks are easy to find. It is a very common heavy equipment starter. It is not an "odd ball ". Fact: the stock 24 volt starters that are in the trucks are actually inferior starters. No matter where I am at now, I can repair my electrical system locally. I live in Ga. But, from time to time it does get below zero here in the winter. The truck starts with no problem. I have never even used the starting aids. The only reason that the military uses 24 volts is for uniformity. They can jump anything from anything.
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