About 2 weeks ago my battery went dead. The battery is fairly new so I suspected my alternator. I charged the battery and it was OK for a day or two and went dead again. I checked the alternator and it was not charging. I charged the battery again and drove the car. I noticed that the windows were working well (for no charging) so I got home and checked the voltage again and now it was at 16.7. I changed the regulator from a known good alternator on my shelf and viola!, 13.8 volts. All was fine for a week now. I put an aftermarket radio in today and it kept shutting off. Finally I realized that it shut off everytime I accelerated. I turned on the lights and blower fan and that ended that. So... it's over charging again. I noticed in a picture of a new alternator that it had a ground tab beside the main plug. I do not have that. Could that be making it over charge? I hate to buy a new regulator, when I'm sure the one I put on was fine. Can anything go bad in the alternator itself that causes this? Thanks, Andy

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Andy
71 350SL (sold), 81 380SEL, 84 300D (just sold), 85 190D (sold), 91 300E, 93 190E (just sold), 79 240D (sold) , 83 240D (living on in my other cars) an 83 380SEL (sold) 82 380 SL and 85 300D. Just bought a 95 SL500.