[Baba O'Riley]

My ‘71 Formula 400 needs a new alternator. Starts are slow and groaning despite a new battery and starter, lights are weak, and last night it wouldn’t restart after being driven 20 minutes. All power cut out, even the dome light, though that came back on after a couple minutes. Car wouldn’t jump from another battery but finally started, strong and fast, off an inverter. While running the voltage gauge shows just under 14V with headlights on, just over 14V with them off.

The original alternator was long gone when I got the car in ‘92, and what’s on there now is a Prostart 7127 piece of junk. I don’t show the car so I’m not into paying crazy $ for anything “correct.” Just something that works well and has a reasonably stock look (no chrome). Car is AT, it had air originally but AC is disconnected now. What would be a good replacement brand and, especially, good amperage for this car? What about the Powermaster units, are those okay? They sell units that turn 85, 100, and 150 amps. Thanks as always for any help, the expertise on here has saved me many times over the decades.