It depends if it has an internal or external regulator. If it has an external one, its could be either, and you'd have to bypass it to see (never did a Benz though). If its internal, then its usually just as cheap to replace the alternator
No matter what, it should be at least 14 volts at idle with nothing running (lights, heater etc)
Thanks. I found a re-manned Bosch in FL or $65 from a dismantler. I'll try that and hope for the best. I got prices as high a $250 plus core for a re-manned Bosch. I'll try to remember next time I need some pieces-and I always do.
I thought maybe you had a problem with the dealership after you posted that wrong price on the auction site-what was it, you sold a 98 500sl on a "buy it now" for $16k or something like that?