I know that this has been posted before but you may want to check your AC Delco batteries for leakage. The positive terminal is the culprit. I am batting a thousand on my vehicles, 5 for 5.
I don't know if they got this taken care of on the 03's but the 01's and 02's are at risk for sure. I have been checking mine every few days and saw the signs on the truck yesterday afternoon. Minor damage from the acid that I cleaned up, painted and put in two Optima red tops. They really spin the engine up nice when starting.
Check early and often, I did not catch the first leaker on the Envoy and the acid had three or four days to do some big time damage.
Anyway, I hope no one else gets hit but I think that the batch of batteries GM was using at the time are all leakers.
Thanks,
BMDMAX
I don't know if they got this taken care of on the 03's but the 01's and 02's are at risk for sure. I have been checking mine every few days and saw the signs on the truck yesterday afternoon. Minor damage from the acid that I cleaned up, painted and put in two Optima red tops. They really spin the engine up nice when starting.
Check early and often, I did not catch the first leaker on the Envoy and the acid had three or four days to do some big time damage.
Anyway, I hope no one else gets hit but I think that the batch of batteries GM was using at the time are all leakers.

Thanks,
BMDMAX