66BlkBB

Am I correct in thinking that an alternator with the stamped date of
5 J 22 is an October 22, 1965 date of manufacture???? Thanks.

tbarb

I don't think the stamped letter I was used so if I'm correct the letter J would indicate September.

leif.anderson93

tbarb is correct.

R66

tbarb, I think you a picking on a blind man - ME
Where is the eye (I) other than after the I'm?
I'm thinking' you are correct about the rest of it though.

Mike67nv

I think tbarb is trying to say, alternator date codes did not use the letter "I" for the month, which is correct.

A – January
B – February
C – March
D – April
E – May
F – June
G – July
H – August
J – September
K – October
L – November
M – December

leif.anderson93

Try this:
"I don't think the stamped letter "I" was used so if I'm correct the letter J would indicate September."

66BlkBB

Thanks. That may be to early for my Dec 6 build. Any thoughts on that????

Mike67nv

It may not be typical (two to eight weeks), but NCRS will accept an alternator date code within six months prior to your build date.

66blackvert

I am also replacing an alternator on my early 66. Ron at Chevy Cool in Scottsdale has some beautifully restored ones for sale if you want to find something closer to your build date.