If the voltage output isn't within specs, you need to replace it or have it rebuilt(about $65 if you have a local shop that still rebuilds them), if there isn't an issue with the wiring. If you buy a new one, make sure to have parts store check it out before you leave, and don't buy one w/o a good warranty, most of the parts store "rebuilt" ones have only had the failed components replaced, have had some not work right off the shelf and others fail within 6 months.
What kind of stereo and amp was installed? If you went with a large amp, a failing/aged alternator could be your problem. The stock alternator was only designed to power stock equipment, i.e., injectors, fuel pump, head/tail lights, HVAC, radio, etc., and large amps or extr, Toyota used a 60amp and a 70amp alternator, those with air conditioning got the 70amp one.
If you recently degreased the engine, that usually kills the alternator shortly after also.
Are you recommending that I do not buy a rebuilt alternator? I did not get an amp with my stereo because I don't have subwoofers yet. If I plan on putting in an amp should I get a high output alternator? And what do you mean by degreased? The motor is a rebuilt engine with only 1000 miles on the entire thing.
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