Generator (Alternator)

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 - JanuaryD - AprilG - JulyK - October
B - FebruaryE - MayH - AugustL - November
C - MarchF - JuneJ - SeptemberM - December

1964 - 283/327  
ACCESSORIESNUMBERAMPS
A/C only110066555
standard110066837
optional 42 amp110066942
optional 62 amp111776562
1965 - 283/327/396  
ACCESSORIESNUMBERAMPS
standard110069337
A/C and optional 55 amp (RPO K77)110069455
optional 42 amp (RPO K79)110069642
optional 60 amp110069760
optional 62 amp (RPO K81)111776562
1966 - 283/327/396  
ACCESSORIESNUMBERAMPS
standard (stamped "CB")110069337
optional 42 amp (Std w/396/375 and transistor ign - RPO K79)110069642
A/C and optional 61 amp (RPO K76)110075061
optional 62 amp (RPO K81)111776562
1967 - 283/327/396  
ACCESSORIESNUMBERAMPS
standard (stamped "CB")111069337
optional 42 amp (Std w/TH400 (stamped "CS") (RPO K79)110069642
A/C only (RPO K76)110075061
optional 62 amp (RPO K81)111777762
1968 - All  
ACCESSORIESNUMBERAMPS
No pulley110069642
6-cyl w/o smog control or P.S.; 8-cyl exc. Turbo-Hydramatic110079437
V-8 w/Turbo-Hydramatic A/C110079561
6-cyl w/o smog control or P.S.; 8-cyl A/C110079661
6-cyl smog control or P.S.110081367
6-cyl P.S.110081542
6-cyl smog control or P.S. A/C110081761
Optional111777762
1969 - All  
ACCESSORIESNUMBERAMPS
standard110083437
6-cyl smog control or P.S.110083637
optional 396-375110083737
extra output RPO (K79)110084242
V-8 A/C110084361
6-cyl A/C110084561
extra output (RPO K85)110084963
1970 - 307/350/402/454
ACCESSORIESNUMBERAMPS
standard with 307/350/402 (L34)/454 (LS3/LS5)110083437
standard with 402/454 L78/LS6 (deep pulley)110083737
A/C only110084361
optional 63 amp (RPO K85)110084763
1971 - 307/350/402/454
ACCESSORIESNUMBERAMPS
standard110056637
LS6 454-425 (engine n/a in the Chevelle)110083737
A/C only110084361
optional 63 amp110091763
1972 - 307/350/402/454
ACCESSORIESNUMBERAMPS
standard except 402/454110244037
standard with 402/454110245437
A/C only110246361
optional 63 amp110246463


1967 42A generator
Date code "7B6," or 1967, February 6


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


1100837 generator with deep pulley.

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