98' Monte Z34 Alt,ABS, problems HELP!!

With 97k on this car and not one single problem. Then alt goes out, then the battery. I replace them both. Ran great for 3 weeks. One day the Anti-Lock light comes on. 15 min later the Volts lights came on. Then the Airbag light comes on. Then the car will not accelerate and dies. I turn it off and try to start it, "dead". I go to work, 8hrs later, car starts I drive home fine. I had the Alt tested. everything is fine. output = 14.00v, diode is good. Put a OBD II reader on it NO CODES. Battery has 12.00+ volts. Disconnect the Batt and clear ECM runs great for 3 days and starts all over. Any ideas out there? Nothing has been altered on this car whats so ever. No changes.

Every once in a while problems occur that do not make any sense. If the alternator and battery are new, I'd check the Alternator battery wire and make sure it is tight. Next, follow the wire and make sure it is not chaffing along the motor and causing a loss of charge to the battery as you are driving. It is possible you may also have a defective alternator. One more thing, the belt tensioner should also be tight and not loose when you rev the engine up. Good luck.

Every once in a while problems occur that do not make any sense. If the alternator and battery are new, I'd check the Alternator battery wire and make sure it is tight. Next, follow the wire and make sure it is not chaffing along the motor and causing a loss of charge to the battery as you are driving. It is possible you may also have a defective alternator. One more thing, the belt tensioner should also be tight and not loose when you rev the engine up. Good luck.

Now there is a error code P0742 = Torque Converter Clutch Circuit Stuck On from what i've read is a generic error code.

That tranny code is something else and was probably set by the alternator not charging and killing the battery. It did not the cause of the alternator light coming on. If everything is okay with the car, that code will reset itself.

That tranny code is something else and was probably set by the alternator not charging and killing the battery. It did not the cause of the alternator light coming on. If everything is okay with the car, that code will reset itself.

Got the ALT replaced under warranty. Manually cleared all error codes. Drove the car for 1 hour or so and no errors or warning lights. Next day driving to work Anti-lock light comes on after 15 min. Still no error codes yet.