I have been waiting for the slow delivery of the alternator parts - new front and rear bushings and brushes so I could rebuild the alternator. It's a 1970 model with a date code of the April, 1970, just in line for the April 30 build date.
The circular casting mark with the "70" in the center and the 12 pie-shaped sections around it is the casting date code. You count the pie-shaped sections with "dots" in them to get the month. At the last filled-in month you count the dots. It looks like one dot in the fourth section meaning it was cast the first week of April, 1970.
The assembly date is the 17th week of 1970 which would be about a week before the car's scheduled assembly date.
Sadly, it looks like this alternator was rebuilt and heavily sandblasted long ago, so the casting marks are not crisp anymore. They also blasted the front casting code into oblivion. I had to heli-coil both front mounting holes back to the original bolt size. It's not the prettiest looking unit but it's correct for the car as it is an original roundback early unit. The later models have a square back without the visible pressed in diodes.
At least the original stamped steel, single groove, pulley was still there. All the modern rebuilds have a solid aluminum pulley that sticks out like a sore thumb on a restoration. It's the Mopar version of the Ford "CAUTION FAN" sticker on seen on every "concorse" restored Camaro. ;-)
Last edited by njsteve; 12-21-2020 at 07:55 PM.
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12-20-2020, 05:31 PM
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