Help Alternator ? Options

[bdog_v]

Hello I have a 94 celica gt while idling at night with the lights on heater on and rear defroster the lights will dim and the battery warning light will come on.
I believe the alternator is dieing. It only happens at idle and it comes and goes. I'd like to get it fixed before it leaves me stranded somewhere.
I am wondering?
-Is there a voltage regulator somewhere outside of the alternator or is it internal? I don't want to replace the alternator when it could be something else that regulates voltage.

-Also where is the best place to get an alternator for this beast? Usually these foriegn alternators go for over $100 bones yikes....


Thanks guys...

[Spider77]

Have to go with Galcobar on this. Dont cut out any ground wires, just upgrade them to a 4-8 gauge wire. Also when you do replace the wires, dont forget to clean the contact areas, as paint, rust etc will interfere with getting a good ground. It also dosent hurt to use some shrink tubing on the connections!