moral of the story, buy genuine and buy it once.
|I have a 1984 Turbo 300D. Battery light did not come on with ignition.
| Alternator was not charging. Did some research here on Google Groups,
| and first checked the charging indicator bulb behind the instrument
| panel. It was fine. The belt was fine. The battery would take a charge.
| Six months ago I had replaced the brushes/regulator on the alternator,
| so I had a sinking feeling that this time the alternator itself was
| dead. However, I had kept the old Bosch regulator with the worn
| brushes, so did a comparison diode check with the contacts on the "new"
| aftermarket regulator (two slot screws take it out). Sure enough--fried
| diodes after six months. Rather than install another cheap product, I
| fired up my propane torch with a tiny flame, unsoldered the good
| brushes from the cheap one, and soldered them into the old Bosch
| regulator. (If you do this, be careful you don't overheat the diodes.
| Bingo--problem solved at no charge. Battery light now works, and
| alternator charges at 14 volts.