1998 Saturn Other Repair Question
Sl2 alternator problem
It could be that the stereo is draining the battery down, and the alternator is having to fight to keep the battery charged, try getting a battery with more CCA.
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rubicant1_2 has a valid point. Is it a large system (subwoffers and high watts) or just a replacement radio type deal.
A bad/weak battery will work an alternator to death in a quick hurry. Have them both tested.
Also check that nothing is draining the battery. In the old days you could simply disconnect the battery cable with the key off and look for sparks. Not a good idea with all the onboard computers. An inductive amp meter should do the trick.
The other thing that comes to mind is that saturn alternators take a bit of a beating. They are located behind the engine with a lot of heat and no air flow. A good quality alternator is a must. I have replaced a few rebuilds bought from some local discount auto parts stores that simply did not last.
Good luck and let us know. :)
19 questions asked