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10-28-2022, 12:20 PM
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#1 |
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Registered User
Join Date: Dec 2011
Location: WA
Posts: 378
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Delco 10si alternator date codes
Did Delco skip a letter in the date code? i.e. 7L12 Would this be 1977 Dec 12
a - Jan b - Feb c - Mar d - April ... ? |
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10-28-2022, 12:32 PM
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#2 |
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Registered User
 
Join Date: Feb 2000
Location: Maquoketa, Ia/ Orr, Mn
Posts: 3,052
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Re: Delco 10si alternator date codes
In my book it shows L as November, 'I' was usually skipped as it could be confused with the number '1'.
7L12 could be 7= 1967, 1977, 1987 (they didn't indicate what decade) L= November 12= 12th day of November A=Jan B= Feb C= Mar D= Apr E= May F= June G= July H= August J=Sept K=Oct L=Nov M= Dec
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'51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com |
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11-12-2022, 04:23 PM
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#3 |
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Registered User
Join Date: Dec 2011
Location: WA
Posts: 378
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Re: Delco 10si alternator date codes
To make the alternator "numbers matching" how close should the alternator be to the build date of the vehicle?
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11-13-2022, 08:51 AM
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#4 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,620
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Re: Delco 10si alternator date codes
One thing to watch if you are recreating a 'proper' alternator for a vehicle is that the output amps were often stamped into the outer case. For example, 63A for an alt with max output of 63 amps. Check the SPID for what alt the vehicle came with and match the output stamp as well.
Not really sure on the normal lag between mfg and installation in a vehicle for alternators. |
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