Alternator Question?

I agree w/ gdizzle. Perhaps Chrysler added that gnd terminal so they could drop the old round-back (1 grounded field) from dealer's stock and provide this single PN for older cars, along w/ a jumper to ground the nearby terminal if an older model. Perhaps someone could find a dealer PN for this mythical jumper to confirm.

Regardless, as TrailBeast said, it wouldn't hurt to run a thick wire (~8 awg) to the block to insure the case gets grounded. Sounds like the factory started doing so later. I keep telling the story when my 69 slant stopped charging 30 yrs ago, and same thing after I installed a rebuilt alternator in the auto store parking lot. I then got the bright idea to clip a jumper cable from alternator case to BATT- and bingo it started charging. Got a quick refund, drove home and sanded the alternator to bracket mounting points and no more problem. Stating "ground problem" can make you seem a genius 90% of the time.