[93GTDIN]

I'm no expert, but I experienced the exact same problem you are having, and if your car is anything like mine, the 140 amp alternator wont fix anything. After I installed my pulleys, one day later the battery was constantly dying on me. So I express ordered a 130 amp alternator. Made the switch, and the problem did not even close to go away. A quick way to check is hook up a voltmeter to your battery. It should read aroudn 14 volts when the car is off and around 12 when the car is on at idle. If you are making 10 or even 11 your battery is not charging properly.

Upon closer analysis, I noticed that the small crankshaft pulley makes your belt spin incredibly slowly, and regardless of how great your alternator is, it just can't spin that alternator fast enough to create the juice needed to power your accessories, and charge your battery, 80 amps, 130, or whatever else.

Another major drawback is your water pump. When using underdrives, your water pump (from my experience) does not turn fast enough to cool off your motor. Sitting in traffic with the AC blasting, I noticed my temperaturue rise slowly, way higher than I'd like it too. After a couple of weeks i was fed up with underdrives, and I figured i'd try and get my 15 horsepower somewhere else.

I trashed the pulleys and bought a blower, which seems to be a little more efficient at the horsepower creating game.

Just my 2 cents.

dino