green 57 210
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Posts: 109
Loc: Rockford IL
Reg: 05-15-08
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04-08-10 07:29 PM - Post#1895238
what is the differance between a 25 and 30 amp generator are the cases the same and are the pulleys the same?
1957 210 four door highland green/surf green 59,000 miles documented 265 3 speed original Interior
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ChevI
Forum Newbie
Posts: 65
Reg: 07-13-08
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04-09-10 05:26 AM - Post#1895383
In response to green 57 210
5 amps.
I believe the generator field coils and the matching regulator are the only differences.55-57 Chevy's used 25-35 amp generators, and the only difference was the electrical load in the car. 55/56 cars used 25 amps unless they had PS/ AC or both and then it was 30 amps. 56/57 cars w/o PS used 30 amps, and 57 cars with PS or AC or both used 35 amps.
What is your generator number?
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 Thurman55
"6th Year" Silver Supporting Member
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04-09-10 06:08 AM - Post#1895395
In response to ChevI
This may help to understand: I worked for Delco-Remy at an alternator (technically a generator in the business)plant. We had employees transfer in who used to build the older generators, such as you are referring to. Within an alternator changing the diameter of the wire size would/could create a completely different output. The people who had built generators back then told me it was the same with generators, a difference in wire sizing would change the output potential. Another factor would be the gap between the stator and rotor on an alternator vs. the field coils and commutator(?) on the generator. The closer the gap--the higher the output. As ChevI stated: you would need to know the numbers on the generator plate to determine what that unit was built as. David
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 f.i.57chevynut
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04-10-10 10:44 PM - Post#1896488
In response to green 57 210
For '57 the 25 amp generator is a 1100326. the 30 amp non-power steering generator is a 1102042. It has a rubber mount on the front bearing plate and a solid mount on the rear bearing plate. The 35 amp generators were 1102083 for air conditioning and the 1102084 for air and power steering. I got rid of the 084 generator a few weeks ago, but the 042 has the same length case as the 084. I hope this picture helps. The pulleys are reversed on the 2 generators. The 326 uses the small pulley. The 042, when used on a high performance engine, uses the 3 5/8 pulley with the 1/2 inch groove.
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green 57 210
Contributor
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Loc: Rockford IL
Reg: 05-15-08
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04-11-10 09:31 AM - Post#1896685
In response to f.i.57chevynut
thanks that helps a lot
1957 210 four door highland green/surf green 59,000 miles documented 265 3 speed original Interior
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57chevypreterist
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Age: 51
Loc: Tampa, FL
Reg: 09-29-05
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04-11-10 03:53 PM - Post#1896822
In response to green 57 210
Tom: On another thread here, someone had mentioned to me that the 25 amp housing could be rewound to a 40 amp output. Do you know if this is correct? I'd like to use my original generator if I could and get a higher output.
Thanks! Bryan
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 Highlander1
"2nd Year" Silver Supporting Member
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04-16-10 10:15 PM - Post#1899914
In response to 57chevypreterist
Used to be a retired Army chopper pilot down in Augusta, GA (maybe N Augusta, SC) that rebuild and sold these things. Now that I am about ready for one I lost my contact info. Anyone know who I am talking about? Thanks!
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f.i.57chevynut
Frequent Contributor
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05-01-10 01:26 AM - Post#1907812
In response to 57chevypreterist
I used to rewind the armitures on my slotcars about 45 years ago, but never a generator. I've been satisfied with the output of my 30 amp generators. If you have an original equipment Delco voltage regulator you can adjust the points to up the amperage, provided you have the proper gauge to measure the change. Maybe your regulator points are worn and not outputing the proper amperage or voltage in the first place.
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