[BNaylor]

Looks like a good write up Bo.Thanks for the time and effort. I was just commenting that using solely a test lamp can give false indications therefore I don't use them anymore for troubleshooting parasitic drain especially on mid 90s cars and up. Also, GM specificies you can have up to 50 mA of current as parasitic drain and still have a perfectly normal electrical system.

I have a question. Why did you have to turn ignition to on to check parasitic load?

I was able to get the test lamp illuminated with ignition off. As the poster pointed out he found something in the HVAC system which is hot at all times and that is the case in other circuits too.

From what I know about GM HVAC systems, the hi-speed blower motor relay has a hot connection at all times regardless of ignition being on. The reason for this is because of the load the fan has in the hi-speed postion so it acts as a bypass and the blower motor will then work directly off battery power. Of course, we all know the blower should not be operating with ignition off and HVAC off but it has been known to happen indicating a problem.

BTW - If you have a manual HVAC system the blower motor resistor is a good starting point. For digital HVAC the A/C Power/Blower Motor Control Module.