'03 Blazer
* 2wd
* 2dr

Once my Blazer is up to operation temp I start having symptoms of a parasitic draw. My volt meter will dip below 14v shifting into park and also if I apply my parking brake. I have gone through all my grounds, cleaning and even replacing some of the connections. My alternator and battery have tested out good.

Any thoughts?

 

test the voltage at the alt and battery, do not rely on the dash gauges too much, they are not the most accurate. They give you an "ballpark" basically.