I found 2 old alternators in my dad's garage. I wondering if I should hold on to them and what date they are and what they could go to:

One says 1100774 55A 9A24 12NFG
the other
Two says 100708 42A J(J-?)14 12VNEG

Thanks for any help. Steve

 

Hi Steve,
The alternator date code typically is year (one digit), month (one letter), and day of the month (one or two digits). 9A24 being (?9, January, 24th)
I don't recognize the 1100774 as being a part number used in 69/70, and the other one?.
I don't think these two were used on Corvettes during 53-72.
Sorry I can't help.
Regards,
Alan

 

These alternators appear NOT to have the voltage regulators built in. Any idea what years that would be?

 

They fall into the 1968 range of alternators but are not used on Chevrolet. The 1100774 is a 1969 Jan 24th with 55 amp so it is not likely on an air conditioned car, which would have been a 60 or higher amp, unless AC was the only option.

The -100708 is missing the leading 1, s/b 1100708 and again, not used on a Chevy. the first J must be a number, maybe 0 and not struck clearly. Second J should be October. And 14th day. The 42 amp would be the base for a low option car.




found more info:

From Buick forum
http://www.buickperformancegroup.com...55A-Alternator

55 AMP #1100774 was used on 1967-70 Skylarks,Grand Sports,Wildcats,Electra 225s,Rivieras all w/AC or other multiple Acc. options,& also Hi-Perf & Spcl.Hi-Perf like GS,GSX Stage 1.


1100708 is possibly 1965 Buick Riviera.
http://forums.aaca.org/topic/176650-alternator/

w/o a/c: Delco-Remy Delcotron model 1100708 - 42 amps 6500 rpm, 30 amps at 1500 rpm - belt tension 80 lbs.
with a/c: Delco Remy Delcotron model 1100709 - 55 amps at 6500 rpm, 40 amps at 1,500 rpm - belt tension 110 lbs.


If they are the square plug in the back, which by the years should be, they need an external regulator.

They will work just like any other Delco alternator. The numbers had to do with the current and the case layout. It could be on a given car, you would need to remove the case bolts, then rotate the housing so that the mounting tabs line up to prevent putting the wiring into something on the engine.

The current ratings are only good for original alternators. If they have been rebuilt, you have no idea what they may really put out. You could have lighter or heavier windings that produce more or less current.

 

Yes I got out the magnifiers and the second one reads as:
Corrected:
1100708- 42A
4J14- 12vNEG

Thanks Steve

 

Thank you very much!

 

You must be new here. You actually came back and said thanks!

 

...ah if 9 years is "NEW"!
I always thank people who take the time to help...
Steve