I have the same problem with a 1997 Chevy Van. The problem seems to be that GM states that a 50 milliamp draw will kill the battery, and that the alarm system is < 50 milliamp, but I can find out how much less.
I have killed several batteries because of this.
Now the trick is to put in a new battery.
When you connect a new battery, the alarm goes off.
To prevent this, with the new battery disconnected, turn the key in the ignition to ON. Make sure the door is closed, and then connect the battery.
This prevents the alarm from going off.
What I did was to install a battery disconnect switch that I use when the van is sitting for more than a week. Now after it has been sitting for awhile, I go out, put in the key, flip the battery switch, hop back in and the car starts.
disconnect battery
take it to a Chevy place
There is no way to disable the factory anti-theft on a Chevy Blazer. Any disconnection of factory installed products voids the warranty on various components on the vehicle.
check your regulator. it maybe over charging your battery
Yes, if it fits the holder.
Under your battery tray
Group 75.
Disconnect the negative battery cable from the battery.
Remove the positive battery cable from your 1997 Chevy Blazer battery. Remove the cables from the front of your starter. Remove the starter retaining bolts. Reverse the process to install the new starter.
Group 75.
Probably a stuck relay.
Under the battery tray. You need to remove the battery and battery tray to gain access.