Have alternator with this code. What is it? Pretty sure the 8J16 is a 8 and not B . first digit. ? Also has 42A on it to

That's a 1969 Chevy Truck alternator. Yours is dated September 16th 1968 and yes, it's a 42 Amp unit.

Ed

I show #1100839 as 1969~1970 Full Size, Optional 42 Amp alternator ...

(edit) - Ed's right, it crosses to 1969~70 Truck also :yes:

Thank you gentleman. Good back up for my car,to sit around. Not worth selling.