6 volt gen. to 12 volt
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=49215
Printed Date: 23 Aug 2025 at 6:10am
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Topic: 6 volt gen. to 12 volt
Posted By: Bob wi
Subject: 6 volt gen. to 12 volt
Date Posted: 18 Apr 2012 at 9:18pm
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Dumb question, can I use my 6 volt generator and install a 12 volt regulator on it and will it produce enough volts for a 12 volt set up ?? |
Replies:
Posted By: Gerald J.
Date Posted: 18 Apr 2012 at 9:22pm
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If you turn if faster it will. It won't do well if you don't turn it faster than it did for 6 volts. Gerald J. |
Posted By: MACK
Date Posted: 18 Apr 2012 at 9:58pm
| If it is a WD with a cut out it will work with the old cutout. MACK |
Posted By: Steve in NJ
Date Posted: 19 Apr 2012 at 7:27am
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And you'll have to turn it pretty darn fast and the ole' girl probably won't like that. If you want to flip over to 12V's, I can convert the 6V Gennie over to 12V. Runs about $250. plus the ride. Or have your local rebuilder do it.. If yer' gonna do it, do it the right way this way you don't invite problems that you don't have time for....
mailto:Steve@B&B" rel="nofollow - Steve@B&B
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Posted By: Dave in il
Date Posted: 19 Apr 2012 at 8:00am
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Steve is right, I had my 44 Massey converted and it works fine. The WD and WC are next. When the WD45 gets redone I might take the alternator off and go to a converted gen so it looks better. If you do it change it to a negative ground too. ------------- AGCO My Allis Gleaner Company |
Posted By: Gerald J.
Date Posted: 19 Apr 2012 at 9:04am
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With constant 6 volts on the field, it only takes doubling the shaft speed to get 12 volts. If the field poles aren't saturated at 6 volts on the field coils, and the field voltage rises with the armature voltage it won't take twice the shaft speed but a properly designed 6 volt generator ought to be close to saturated fields at 7.2 volts for a 2 brush generator with regulator. Back about 57 years ago my dad and I picked up a 12 volt generator and rewound it for 24 volts. We didn't hire it done, we did it. I learned much about generators and 5 years later in an electrical machinery college course I learned that simply speeding it up would have provided 24 volts for that surplus radio equipment. Gerald J. |
Posted By: Coke-in-MN
Date Posted: 20 Apr 2012 at 10:10pm
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Why not look for a GM auto or pickup generator from 55 to 64 year range as its a 12V unit already , have long and short frame and also some had a power steering pump drive on them also . Sure easier than converting a old on . ------------- Life lesson: If you’re being chased by a lion, you’re on a horse, to the left of you is a giraffe and on the right is a unicorn, what do you do? You stop drinking and get off the carousel. |
Posted By: Tracy Martin TN
Date Posted: 20 Apr 2012 at 10:19pm
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Why can't someone make an altenator that looks like the generator that came on the tractor.What is the internal differance? Looks like they would sell well. Tracy Martin ------------- No greater gift than healthy grandkids! |
Posted By: SteveMaskey(MO)
Date Posted: 21 Apr 2012 at 8:28am
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I put a 12 volt battery in my H Farmall and used a 12v regulator off a CII
Gleaner I had in the junk. I left the 6v generator on it and left it positive
ground. It's been working for 15+ years and never give any trouble.
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Posted By: Gerald J.
Date Posted: 21 Apr 2012 at 12:35pm
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Difference between generator and alternator. Fundamentally they are the same, with the generator using a mechanical rectifier, the commutator, and the alternator using silicon diodes for rectification. The output winding in the generator in in the armature and fixed in the alternator. The generator generally has 2 field poles and the armature (holding the output winding) spins in a magnetic field. The alternator field rotates and with the interdigital fingers one winding makes a bunch of alternating poles that spin the magnetic field within the stator winding. Basically when a wire moves relative to a magnetic field, current is induced. More current and voltage is induced the faster that relative motion. So the alternator is short and fat to get a faster relative motion. And the rotating field construction is resistant to centrifugal force so 10,000 rpm is handled easily. 10,000 rpm will likely throw the windings out of the slots of a generator armature. Then the fixed stator of the alternator has no sliding connections carrying high current, just slip rings to the rotating field carrying a couple amps and alternators have been built without slip rings. An alternator can and has been built in the long, relatively slim shape of the classic generator and generators have been built short and fat like an alternator. I think later years of VW beetles had an alternator in the same package as the previous generator. When manufacturing material pennies are being pinched, the modern alternator shape probably uses less steel and copper than if built the shape of a classic generator. In VW's case changing the rigid generator mount that was belt driven from the rear of the crank shaft while also mounting the important engine cooling fan on the front end of the generator/alternator overrode the materials cost, I suspect. Gerald J. |
Posted By: jaybmiller
Date Posted: 21 Apr 2012 at 3:32pm
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Tracy..have a long look on the net..someone does put alternator innards into a genny body but at a huge cost !! I looked into it 2-3 years ago and there was no way I could justify the $350-$400 price tag!! Can't remember who does it..heck I lost a day cause I couldn't remember what side of the stub the clutch fork was on my D-14....
Bottom line it can be done...I actually thought about using a 'nippon-denso' alternator for my G,right size(it does fit),tons of power,minor bracket fab-ing...just another 'winter project' still on the shelf...sigh.... ------------- 3 D-14s,A-C forklift, B-112 Kubota BX23S lil' TOOT( The Other Orange Tractor) Never burn your bridges, unless you can walk on water |
Posted By: Steve in NJ
Date Posted: 21 Apr 2012 at 8:23pm
There is a Generator out there with Alternator innards. It also can be used as a one wire, but as Jay mentioned, it is an expensive unit. I looked into doing one of those back bout' 5 years ago or so, but never got the time to do the inside design. Still have the gennie chassis and some Alternator parts still sitting on the shelf yet for that project. Maybe when I retire, I'll git' more time to play around wit' it....  Steve@B&B |
Posted By: Brian Jasper co. Ia
Date Posted: 21 Apr 2012 at 9:04pm
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If you take the 6v battery out and put a 12v battery in it's place, change nothing else on the charging system, it will work fine. I ran my CA that way for a year before putting a D17 generator and regulator on to have more capacity for extra lights. Not necessary to speed it up. ------------- "Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford |
Posted By: Gerald J.
Date Posted: 22 Apr 2012 at 10:58am
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Charging a 12 (or 8) volt battery with an unaltered 6 volt generator will ONLY work if it IS a three brush generator using only a cutout, it won't work if the generator is a two brush with a voltage regulator. But the 3 brush generator will also overcharge the battery on long runs. Gerald J. |