I am totally stumped and so are the dealers.
My wife was driving to work one day last month and lost all her lights,
then the car just stopped. I had i towed home and thought perhaps a
new battery would fix it. My son in law discovered the starter was
gone so I picked up a re-man and he installed it--voila! It seemed to
fix it...but after it had run for 15 -20 minutes a loud screeching
sound began which he eventually traced to the starter. It seems that
all by itself the starter would re-engage (or perhaps not disengage)
and it pretty well cooked it. We took it back and exchanged it for a
new one and thought we had solved the problem but after 20 min or so it
began to do it again.
Next we replaced the ignition switch as suggested but that didn't solve
it either. We tried an new switch but that didn't change anything
either. We have also checked and changed the relay.
We have searched to see if someone had installed a remote starter but
there is none. His code reader doesn't show
The GM folks have no idea what the problem is and say they've never
heard of such a thing.
Meanwhile the car sits in the driveway... The only other source of
power to the starter is the the instrument cluster per the schematic.
CAN ANYONE HELP PLEASE!