Originally posted by jdm1990
Ok, I'm running MS-1 on full standalone, thus no voltage regulator :( I'm currently running a 4g63 alternator (only 60 some amps). Works ok and keeps my volts around12.7-13.5. I m hoping swaping to the Saturn alternator (200 volts, which is closer to the stock 420a) will keep my voltage around 14.0/14.5. My questions is about the field wire. The gst alternator now has the volt field wire tied directly into the positive battery terminal, and I know that's probably not the correct spot. So where should the field wire be placed? With the factory setup using the ecu as the voltage regulator I'm not sure where I should tap the field wire to ensure everything is staying properly charged in regaurds to how the factory setup would. So any information that may help the situation would be amazing! Thanks in advance, hopefully I'll have it swapped over in the next week or two.

You have a lot of misinformation going on... Let me clear a few things up. First of all, the stock Saturn alternator that will fit our cars is not anywhere near 200 amps (not volts). They are usually 90-105 amps stock. The 4g63 stock alternator puts out 75 amps. A stock 420a alternator puts out 85 amps. Any of these can be rewound to create a "high output" alternator.

I had a 200A high output Saturn alternator for a while but it died, so now I'm running dual alternators. Any "1-wire" alternator would work nicely for you as it did for me as a secondary alternator. These alternators have a built-in voltage regulator that is powered by the alternator itself once it gets up to speed. This way, all you have to worry about is connecting the output (charging) wire to the battery.

Read my post here for more info: http://forums.2gnt.com/dcboard.php?az=show_topic&forum=5&topic_id=136932&mode=full