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Q: intermittent start, doesn't turn over on 1990 BMW 325i

1st the car is a 1987 BMW 300 series, not a choice. I replaced the alternator as the car was not charging. Now it charges fine, but three days later it started intermittently refusing to start. When it does this, the starter does not click, it can not be jumped, and repeated turning the key does not result in starting. I have to push start it, occasionally this happened several times in a row. Later it will start just fine several times in a row, then it won't start again. Now the last three days it starts fine, so I am at a total loss. The car drives great, and the problem did not start until after the alternator was replaced, but I had been push starting the car for 3 weeks, while I waited to get to the shop to replace the alternator myself. The alternator had been producing enough power to drive the car, without headlights, but not enough to charge the battery. I don't know what the small part I replaced is called, but the battery charges great now and everything else works.
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Check the REGULATOR at the back of the Alternator .
When explaining starting problems please go like this .
Starter SPINS but ENGINE wont turn over
You'll need to perform a diagnosis of the starting system when it's acting up. Check for power to the starter solenoid, and if it isn't getting power when trying to start the engine, trace the circuit back to the ignition switch until you find the problem.
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