[transam1972]

my nov.71 T/A has an 80 amp. alt. with 1101015 1L 3-12-V 80A NEG, does this mean anything?...does this indicate an original or replacement alt.?...kinda bored so I thought I would look for interesting numbers...thanks!!

[johnta1]

It's for 71 to 74 80 amp cars.

I think the '3' is part of the 1L3?

It would be Nov 3, 1971 alternator.
What's the build date on your car?

[transam1972]

sometime after nov. 21st 1971, so that is the original alternator...thank you!...how would you know the exact day the car was built?

[johnta1]

I don't think one can tell the exact day a car is built.
The date code on the cowl tag is a general date.

[Formulabruce]

Originally Posted by transam1972

sometime after nov. 21st 1971, so that is the original alternator...thank you!...how would you know the exact day the car was built?

On the bottom of your PHS, the "Date of execution" is the date at which your vehicle moved under its own power, and the manufacturer could set the interest timer to the dealerships. This timer was 1 month. ( allowing shipping and maybe some unfinished car lot time, and this was NOT strictly "adheared" to on ordered cars, as they had a buyer and interest to dealerships on unsold car did not matter) This can be and usually is considered the final build, or "Bill to" date.
Example, my old 72HO was "executed" on Nov 22, 1971, which was a Monday. The cowl tag should reflect 11D build date.
Here is a December map for 1971 ..your cars build date may be in here

[transam1972]

ST 72 22387NOR 131188BDY 26 26PNT 11CA51WS4 TR 216 cowel tag my car was registered 11 30 1971 .....my question is when was the alternator stamped...at Norwood?...I need to find my PHS to figure out the actual build date?..thanks everyone!!....I have already posted my tag info.,possibly the vin...I believe anyone buying a vintage car should be aware of a possible fake...there is only one car that's real with my vin. and tag,and that is mine.

[Formulabruce]

You car was built in 11C , looking the Calendar, you can see the window it fits into. ( 15th-19th)
If shipping wasn't too far its easy to see how the car could have been finished and delivered and registered by 11-30

[Held for Ransom]

Although it works in this case, I'll point out that Fisher Body dated their bodies in a fixed way.
Week A is the 1st-7th,
Week B is the 8th-14th,
Week C is the 15th-21st,
Week D is the 22nd-28th and
Week E is the 29th-31st.

Looking at your PHS and the Date Shipped may pinpoint a certain day completed.

[johnta1]

my question is when was the alternator stamped...at Norwood

At Delco I believe, then delivered to Pontiac for installation.

[transam1972]

thank you Formulabruce...because my car was shipped from Norwood,Ohio to Jersey City,N.J....and I am certain it was ordered...and I will be contacting the original owner soon...