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Military MEP and Aircraft Gen-Sets MEP Mobile Electric Power, APU Auxiliary Power Unit and other military surplus generators.

Military MEP and Aircraft Gen-Sets

Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5


Hi all, its got a Hercules 4cyl. I cant figure out for the life of me if this is supposed to be...

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Old 12-15-2012, 07:13 PM
johnnyrock70 johnnyrock70 is offline
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Photo Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5

Hi all,

its got a Hercules 4cyl.
I cant figure out for the life of me if this is supposed to be started with a 12V battery or 6V? The age (1943) is telling me 6V. But I'm not sure.
There are no markings/info anywhere on it to indicate this information. I can start it with a 12V battery, and it runs quite well. But I dont know if I'm doing any electrical damage running it on a 12v battery.
Does anyone know the answer?
thanks
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1943generator (4).jpg   1943generator (2).jpg   43genWWII (2).jpg   generatorlabel.jpg  
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Old 12-15-2012, 07:15 PM
johnnyrock70 johnnyrock70 is offline
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Default Re: Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5

This is a 3-phase ...and, the Hercules 4cyl is the same exact engine in the AVERY V tractor.
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Old 12-15-2012, 08:44 PM
Tony Rye Tony Rye is offline
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Default Re: Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5

turn the sw on with a 12 volt battery installed ck. voltage at the coil if you have 12 volts there it a 6 volt sys maybe 8 volts
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Old 12-15-2012, 09:38 PM
Rich Mc Rich Mc is offline
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Default Re: Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5

12 volts might current stress the ignition coil and voltage stress the cut out relay on the generator voltage regulator.
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Old 12-15-2012, 10:01 PM
John Schwiebert John Schwiebert is offline
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Default Re: Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5

Was the Military 24 volts in 1943? They Were later on/ Are there model numbers on the starter> Does it have a generator to charge the battery?
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Old 12-15-2012, 11:39 PM
Rich Mc Rich Mc is offline
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Default Re: Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5

I think that both your starter and generator have a 6 volt rating marked on them.
try this link for the manual on line
http://www.tm-ww2.com/product_info.p...ac7b7a156bd165
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Old 12-16-2012, 12:07 AM
Dave Abbott Dave Abbott is offline
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Default Re: Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5

check the starter itself if its on the engine----if its generator start i don't know
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Old 12-16-2012, 12:11 PM
KidDynamo KidDynamo is offline
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Default Re: Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5

I don't have my manual handy but I recall posting about it being 6 volt negative ground.

Read here?......... http://www.smokstak.com/forum/showth...egative+ground
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Old 12-16-2012, 03:45 PM
Lloyd H Lloyd H is offline
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Default Re: Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5

If this unit has a belt drive generator, make sure you polarize it when changing battery polarity. Serious damage to the cutout can result if the generator is opposite polarity from the battery. Check the coil as well for polarity. If it is equipped with an ampmeter it will likely read backward with wrong battery polarity as well.
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Old 12-16-2012, 06:05 PM
scottie scottie is offline
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Default Re: Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5

these are 6 volt neg ground
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Old 12-17-2012, 08:54 PM
coyote62ny coyote62ny is offline
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Default Re: Do I need a 6 or 12 volt? 1943 GENERATOR MILITARY M5

scottie is correct 6 volt negitive ground. as far as i know the starting battery has nothing to do with the ac generator.i can tell you that you get 125 volts from any combination of two wires in the military 3 pin plug so A+b,a+c,c+b that gives you 3 125 volt pairs remember you can only draw 1000 watts from each pair for a total of 3000 watts. these sets run nicely at about 15 amps max. not a power house but useable. use a hand held multi meter with hertz setting and set the govenor to run at 62 hertz no load when its at full load you will see about 60 hertz. these sets run real quiet and mine is set at 62 hertz no load and the engine runs at 1450 rpm no load with full load mine runs about 59.5 hertz at 1175 rpm. use only sae-30 non detergent oil these engines have adjustable oil pressure and it will only have 12 to 15 lbs oil pressure at operating temp. also make shure you put grease in the two grease cups on each end of the ac generator. and dont forget the grease cups on the distributor and water pump. also there is a brass screw slotted plug on the fan hub in front of the belt pulley fill with sae-30 non detergent oil till oil drips from the shaft in back of the fan belt pulleyif you dont oil the fan you will set it up on the shaft and put the fan through the radiator. hope all this helps you get it going
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