It would appear to me the "61a" is telling you it's 61 amps. I can't
find the #1100796 in my parts book, so can't tell you the application of
NCRS indicates the '63 base unit should be a 37 amp, #1100628. Looking
up a replacement alternator (GM referred to it as a generator) in my '79
dealer parts book, I see they were calling for the following:
With the following notation: "Replaces 37 amp generator"
This rebuilt unit and a brand new 42 amp unit are the only listings
given for a '63 replacement.
To recap, it appears you're using a 61 amp alternator in place of the
original 37 amp unit which was subsequently dropped by Chevrolet with a
42 amp alternator specified as the direct replacement. Long explanation
short - I'd say the 41 or 42 amp replacement you bolt on would do just
Here's waving to ya - \||||
'67BB & '72BB
-- not affiliated with JLA forum in any way -- alt.autos.corvette is
original posting --
"To know the world intimately is the beginning of caring."
-- Ann Hayman Zwinger
no problem, the current rating is the max the alternator can put out at
rated speed, as long as its for a 12v system you don't have to worry. the
built in regulator and condition of your battery control how much current
flows, you will just have a bit more of reserve current than before --- in
this case more is better. Putting in an alternator with a lower rated
than the oem will cause problems and lots of blown alternators.
Thanx for the info. After doing a bit more research it appears that the
current alternator is for a 1968 Chevelle or Camaro and was rated at 61 amp.
I was surprised as when I bought the car in 1975 it had about 65K mi. and I
assumed the alternator would last longer than that. I rebuilt the alt. at
about 75K myself . As I don't plan on installing any monster sound system or
A/C, it appears that a 41 amp. should do the job. I have already purchased
the correct regulator and a new battery so I should be good to go. Thanx
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