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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Shade Tree Mechanic
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OP
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I would but the decision would be easier if I KNEW the engine bracket is correct.
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ChatMaster - 7,000
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If you post some dimensions I am sure someone will be able to advise if it is correct. Have you tried using a different cut-out?
Steve D
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Shade Tree Mechanic
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OP
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I did......last post on page 2:
I'm in something of a dilemma not knowing even if the mounting bracket is correct for the right generator.
The one on the engine now measures 6 7/16" ID and 7 1/16" OD but the mounting holes to the engine are a perfect match so.......
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Shade Tree Mechanic
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OP
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That's what I'm hoping but I haven't gotten a definitive answer yet. Converting what I have is extremely simple but NOW the problem is finding a 20 amp regulator for 6 volt negative ground.......  Just a couple hours ago I took the generator off to double and triple check things, ALL of which check out, only to experience the same problem of over charging. I'm getting real good at R&R the generator though.......  I'm getting REAL ready to jump on this one and be done with it! ebay generator
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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The generator on eBay is also a three brush generator that uses a cutout. The seller indicates that the generator has not been tested so for $150 and not knowing if the generator works or not, I wouldn't waste the money. Also, for a "supposedly" rebuilt generator the generator doesn't look like it is in very good shape. You might be better off taking your existing generator to your local starter/alternator shop and have them find the problem.  
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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The generator on ebay also has the field earth terminal on it which is meant to be connected to the charge resistor on the rear of the Master light switches to lower the charging rate with all lights off.
CJP'S 29
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Thanks but the only shop left around here that actually services those things is the shop I sold. I'd probably wind up paying more for someone else to do whatever to an incorrect generator than the one I can buy which has a 30 day return policy. Spray paint is cheap. I'd rather take my chances on something that was rebuilt back when people still had a clue....... BUT.......I messaged the ebay seller who told me the distance between the mounting ears is 6" so........  At least what I have fits so IF I can find a B Circuit, 20 amp, negative ground regulator I'll do the conversion. There's also a rebuilt 643-J on ebay too but it's $230!
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The mounting bracket I have on my car is 6-1/8" O.D. The ears of the generator are mounted on the outside of the mounting bracket ears. Someone suggested to "hot wire " the fields by connecting a jumper wire from the BAT terminal to the Field terminal and then try adjusting the third brush (only for testing). He said possibly the cut-out only cuts in when the voltage is high . I would look for a correct generator and mounting bracket along with a new cut-out.
Last edited by m006840; 08/23/17 08:43 PM.
Steve D
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The generator on ebay also has the field earth terminal on it which is meant to be connected to the charge resistor on the rear of the Master light switches to lower the charging rate with all lights off. Oh crap........if it isn't three things it's four. Must that extra wire be used? Chances are I will never drive this car a night anyway. m006840......your reply came in while I was thinking and composing this message and thanks for the bracket dimension! I can shorten the existing bracket, no problem. If that extra wire must be used I guess I'm stuck with a 643-J....... :(
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Tech Advisor ChatMaster - 25,000
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Yes, spray paint is cheap.....but that is not the issue. Look closely at the photos of the inside of the generator....for $150 it is not a quality rebuild. I agree....putting money into your incorrect generator is not a good thing......nor is putting a lot of money into another incorrect generator on eBay either. However, there is a 943-J generator on eBay for only $22.50. Can't beat the price. It needs a rebuild but it would be cost effective since it is correct, it is complete, and is a good candidate for a rebuild.... and it may even work as is. If it does work.....then, as you said, spray paint is cheap. Also, the generator appears to have the correct cast iron pulley, which alone is worth way more than the $22.50 asking price of the 943-J generator. By the way, the generator on eBay for $229 is a 943-J, not a 643-J. The 943-J is the correct generator for your car. Hang in there.....you will get the issue resolved.
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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I'm a hangin'........ LOL I have that generator on my watch list >>> 943-J I might be stubborn at times but I HATE it when something that checks out in every way STILL won't WORK....... I'm fed up enough to pull the switch and just BUY it.......  I can't thank you guys enough........but I'm no done yet either....... LOL Update........DONE!
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Shade Tree Mechanic
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Because it's MINE.......
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Jul 2017
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Shade Tree Mechanic
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I couldn't find it........  At this point I don't care......I just want this episode to end. There WILL be more to come. I have to trace the gas gauge wire between the gauge and the tank. The gauge is showing OVER full ALL the time. I finally disconnected the wire. There's a dead ground somewhere....... 
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Joined: Nov 2001
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Tech Advisor ChatMaster - 25,000
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Tech Advisor ChatMaster - 25,000
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The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
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Joined: Jul 2017
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Shade Tree Mechanic
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Crap.......the number doesn't werk.
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ChatMaster - 7,000
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Just search " generator $22.50" . If you don't buy it let us know.
Steve D
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Thanks but no soap though I DID find this one >>> ebay generator $27.50
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Looks like it might have sold as it was there when I posted. Can't tell about the other you looked at as the model number is not clear.
Steve D
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The $27.50 generator is a later model. Note the two holes for wires and the fan indicative of a ventilated generator.
How Sweet the roar of a Chevy four!
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Technical Advisor ChatMaster - 10,000
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Don't worry about the $22.50 generator, it's gone. 
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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That's what I thought probably happened but ebay ALWAYS (I thought) archives completed auctions.
It must have been listed as for sale rather than an auction to just disappear.
At any rate I'm considering buying the one I mentioned.
Fix, paint and maybe make a few bucks.
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