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Generator (Alternator - Group 2.275) - Regulator↓

 

The date code on a generator is simple to decode. It includes the year, month and day such as 7K25. This decodes to 1967, October, 25th. Month codes are A through M for January through December (omitting the letter 'I').

 

A - January D - April G - July K - October
B - February E - May H - August L - November
C - March F - June J - September M - December

1964 - 283/327    
ACCESSORIES NUMBER AMPS
A/C only 1100665 55
standard 1100668 37
optional 42 amp 1100669 42
optional 62 amp 1117765 62
1965 - 283/327/396    
ACCESSORIES NUMBER AMPS
standard 1100693 37
A/C and optional 55 amp (RPO K77) 1100694 55
optional 42 amp (RPO K79) 1100696 42
optional 60 amp 1100697 60
optional 62 amp (RPO K81) 1117765 62
1966 - 283/327/396    
ACCESSORIES NUMBER AMPS
standard (stamped "CB") 1100693 37
optional 42 amp (Std w/396/375 and transistor ignition - RPO K79) 1100696 42
A/C and optional 61 amp (RPO K76) 1100750 61
optional 62 amp (RPO K81) 1117765 62
1967 - 283/327/396    
ACCESSORIES NUMBER AMPS
standard (stamped "CB") 1110693 37
optional 42 amp (Std w/TH400 (stamped "CS") (RPO K79) 1100696 42
A/C only (RPO K76) 1100750 61
optional 62 amp (RPO K81) 1117777 62
1968 - All    
ACCESSORIES NUMBER AMPS
No pulley 1100696 42
6-cyl w/o smog control or P.S.; 8-cyl exc. Turbo-Hydramatic 1100794 37
V8 w/Turbo-Hydramatic A/C 1100795 61
6-cyl w/o smog control or P.S.; 8-cyl A/C 1100796 61
6-cyl smog control or P.S. 1100813 67
6-cyl P.S. 1100815 42
6-cyl smog control or P.S. A/C 1100817 61
Optional 1117777 62
1969 - All    
ACCESSORIES NUMBER AMPS
standard 1100834 37
6-cyl smog control or P.S. 1100836 37
optional 396-375 1100837 37
extra output RPO (K79) 1100842 42
V8 A/C 1100843 61
6-cyl A/C 1100845 61
extra output (RPO K85) 1100849 63
1970 - 307/350/402/454
ACCESSORIES NUMBER AMPS
standard with 307/350/402 (L34)/454 (LS3/LS5) 1100834 37
standard with 402/454 L78/LS6 (deep pulley) 1100837 37
A/C only 1100843 61
optional 63 amp (RPO K85) 1100847 63
1971 - 307/350/402/454
ACCESSORIES NUMBER AMPS
standard 1100566 37
LS6 454-425 (engine n/a in the Chevelle) 1100837 37
A/C only 1100843 61
optional 63 amp 1100917 63
1972 - 307/350/402/454
ACCESSORIES NUMBER AMPS
standard except 402/454 1102440 37
standard with 402/454 1102454 37
A/C only 1102463 61
optional 63 amp 1102464 63

 

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1967 42A generator
Date code "7B6," or 1967, February 6
Note the "CS" ink stamp is also the broadcast code

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1970 37A generator
Date code "9H21" or 1969, August 21

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1100837 generator with deep pulley.

Courtesy Bill Hall
1972 61A generator
Date code "1J22," or 1971, September 22

 

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When mounting on 1964-1968 Chevelles, the 'clocking' of the generator is important. The electrical connections should be at the 3 o'clock position.

 

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A Very common error is mounting the 1966-1968 generator. The adjustment brace goes behind the mounting location on the alternator and the bolt and washers are attached from the rear.

 

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The one exception is the L79 engine. Note there are two adjustment braces, both attach to the front of the generator and the bolt and washers also attach to the front. The rearmost brace is supplied from the engine plant and are painted orange while the front brace is supplied by the final assembly plant and is painted black.

 

Voltage Regulator (Group 2.500)

 

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Chevrolets used basically the same voltage regulator until 1971 when all GM alternators used integral voltage regulators. Delco-Remy merged with AC-Delco around 1973-1974. Early over-the-counter regulator boxes had both the GM Group Number and GM Part Number such as Group 2.500 and 1119515. Later over-the-counter regulator boxes had the aftermarket designation part number D635 along with the GM part number 1119515. Just when these changes occurred isn't known. (Click a regulator  image to enlarge.)

 

Part number 1116378 was used with the transistor ignition option.

 

Part number 1111915 was used from 1962 through 1972 for all except those optioned with the 63 amp alternator.

 

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1971-1972 w/63 amp 

 

There is a date code stamped on the regulator mounting surface. This code is the year and month. The example here, 5D, is 1965 - April.

 

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1964-1972 Chevelle Facts & SS Guide Shop Manuals & Parts Catalog 1966/1967 Chevelle Reference CD
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