Quote:
Originally Posted by Oldmactech
Kinda what I thought. Has to be electrical and I have had issues similar with an e46 that were fixed with a new battery.
Thanks. Reassuring.
Is an alternator rebuildable by a mediocre skilled shade tree guy?
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Changing just the brushes is 2/10 difficulty. Slip rings 4/10 difficulty. It's easier than changing the alternator which is 5/10 or 7/10 (until you learn the nut insert trick)
It's very rare that a bad battery will cause problems while driving, it's usually that a new battery will mask voltage regulator problems buy acting as a voltage smoothing filter. Similar for a bad starter. As a starter starts to fail it takes more and more current to do its job, this will pull the voltage down do to resistance loses. A new battery will hide the problem and results in quick battery failure. Slow rpm long crank is a symptom of a bad starter not bad battery.
A freshly charged end of life battery will usually crank almost normal speed. (but may fail to crank 3 times in a row as the capacity is what goes away).