Bigger Alternators for Junkyard Scroungers like me

I thought this might be of interest to folks wanting a bigger alternator. These are stock 10SI or 12SI units that you can get at the autoparts store. Or you can dig through a junkyard if you want to cross reference the part numbers. Easy to wire in. FOr the full link, go here http://www.madelectrical.com/electricaltech/delcoremy.shtml

Admin's move to a better place if there is one. Thanks......

Model
Output

Rating
Clock

Position
AC Delco

Part #
*Lester

catalog Pt#

10SI
63amps
3:00
321-39
7127-3

10SI
63amps
9:00
321-41
7127-9

10SI
63amps
12:00
321-43
7127-12

10SI
63amps
6:00
321-135
7127-6

12SI
94amps
3:00
321-266
7294-3

12SI
94amps
9:00
321-269
7294-9

12SI
94amps
12:00
---------
7294-12

12SI
78amps
3:00
321-247 or

321-357
7278-3

12SI
78amps
9:00
321-244
7278-9

12SI
78amps
12:00
321-249 or

321-254
7278-12


*Lester is an automotive catalog service company. (They do not make

Application Data to ask for at the parts counter

10SI, 63 amp, at 3:00 (AC-DELCO # 321-39, Lester #7127-3)
Tell the auto parts counter person that “The alternator is for a 1978, Chevy Camaro, 8cylinder 350engine, with air conditioning.”

10SI, 63 amp, at 9:00 (AC-DELCO # 321-41, Lester #7127-9)

Tell the auto parts counter person that “The alternator is for a 1979 Buick Regal, 8 cylinder 4.9L (301W) engine, with air conditioning.”

10SI, 63 amp, at 12:00 (AC-DELCO # 321-43, Lester #7127-12)

Tell the auto parts counter person that “The alternator is for a 1977 Pontiac Grand Prix, 8cylinder 5.7L (350R) engine, with air conditioning and with H.B.L.” (H.B.L. = Heated Back Light–meaning rear window defroster)

10SI, 61amp or 63 amp, at 6:00 (AC-DELCO # 321-135, Lester #7127-6)

No application was found. 6:00 position would put the two wire harness connector in direct interference with the “main mounting bolt,” and so it’s possible that no passenger cars used SI series with 6:00 positioning. (It’s also why we did not list part numbers for the 94amp and 78amp model 12SI alternators, in the table above.)

12SI, 94 amp, at 3:00 (AC-DELCO # 321-266, Lester #7294-3)
Tell the auto parts counter person that “The alternator is for a 1984 High performance Chevy Camaro, with 5.0L (305G) engine, 94amp alternator

12SI, 94 amp, at 9:00 (AC-DELCO # 321-269, Lester #7294-9)
Tell the auto parts counter person that “The alternator is for a 1985 Buick Riviera, 5.0L (307Y engine), with Heavy Duty options and Air Conditioning.”

12SI, 94 amp, at 12:00 (AC-DELCO #none found, Lester #7294-12)
No AC DELCO part number or application was found for this output model at 12:00 position.

12SI, 78 amp, at 3:00 (AC-DELCO #321-247, Lester #7278-3)
Tell the auto parts counter person that “The alternator is for a 1985 Pontiac Firebird, 5.0L (305H) engine, no air conditioning, H.B.L. only.” (H.B.L. = Heated Back Light–meaning rear window defroster)

12SI, 78 amp, at 9:00 (AC-DELCO #321-244, Lester #7278-9)
Tell the auto parts counter person that “The alternator is for a 1985 Oldsmobile Cutlass Supreme, 5.0L (307Y) engine.

12SI, 78 amp, at 12:00 (AC-DELCO #321-249, Lester #7278-12)
No application was found for this output model at 12:00 position.

 

so I replied so this post will not be pruned. is this how it works,there is alot of info here.

 

Great information! I had a bookmark that I was going to add, come to find out it was the same one. I put the 12SI 94 amp unit on my plow jeep. It was a great low buck addition.

 

bump for some good info.

aallison, what alternator did you go with?