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Old October 25th, 2022, 02:59 PM
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Alternator Date Code
Wondering if one of you might be able to decode this for me? Trying to find out if it's original to a 72,000 mile survivor car. Thank you.
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Old October 25th, 2022, 03:11 PM
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Looks like March 23, 1970. 55 Amp. F85
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Old October 25th, 2022, 03:28 PM
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Originally Posted by Blue442
Looks like March 23, 1970. 55 Amp. F85
So O is 1970, C is March and 23 is the day? Original to this April 1970 built Cutlass, thank you!
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Old October 25th, 2022, 05:14 PM
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You are correct in your decode. Here's the alternator for my late October '69 built 442. 9K6 date code = October 6, 1969. 37 amp. The longer top left number indicates usage.
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Old October 25th, 2022, 08:35 PM
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Was the 55 Amp an optional higher amperage alternator? This car has power everything so that would make sense.
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Old October 26th, 2022, 07:42 AM
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As I recall, the 55 amp alternator was used if a car came with A/C or the heavy duty cooling option.

Randy C.
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