MY 1988 Monte Carlo SS 2 owners, kept in the family until me. It was great when i bought it now its having electrical problems every couple of months or if a drive her a decent amount the battery will just die on me I have replaced the battery three times and a 4th soon since she died on me 2 days ago in my driveway. I tried just jumping it and letting it charge up, it died when I got to my friends house. I replaced the alternator already, and then had that one checked at auto zone and it passed. I have no idea what is wrong, I am not good with electrical stuff. I also checked the grounds and they were fine from what I saw. Someone help me i beg you.

 

If you know for certain the battery, alternator and corresponding wiring is all in good order then you have a parasitic drain. You can narrow down the culprit circuit by connecting a multimeter to the battery and observing the draw while unplugging fuses. When you pull a fuse that greatly reduces the draw you found the problem circuit. Aftermarket stereos, lighting, etc. are common parasitic drain locations.

 

Perhaps A wiring problem, the electricity the alternator IS generating is not getting back to the battery, a broken “ground” wire on the back of the alternator or a faulty battery cable or battery cable end or just a loose or dirty battery cable could be the problem.

 

What Motor is in your Monte?

Chevy V-8's Back then were notorious for starter issues...

Heres an Educated guess:
Since you replaced the Alternator and Battery...

If I were you id pull the starter out of it... and check or replace the Bendix..
If your not sure how to check it... Take it to a local auto parts and have them check it out for you...

An open or short circuit in the Bendix, will cause a rapid drain of the Battery!

 

Just a little clarification:

An open circuit in the solenoid will cause the starter motor to not rotate.

A short circuit in the solenoid will cause a parasitic drain.

 

Thanks!
For the Clarification!
Lets just hope it solves his issue!

 

starter is fine previous guy dropped in a 350. The Starter isn't getting enough electricity to turn the motor over. Ill have to check that when im off from work next.

 

I am working on the ground working from the back to the front.