2004 chevy blazer 4.3l 4x4. Here is the problem, battery drains within an hour from fully charged with new batteries. The draw actually does not start until the timer ends its cycle which then activates only the temperatures gauge from 0 to 210. Restarts when voltage is applied. Also you can barely see the parking light stay lit for 12 seconds. Heres where it gets stranger. When u cycle the power on at key and back off timer is started for radio and windows. However it should be triggered to shut off if door is open but you actually have to push window keys which makes lights flash and dim and shuts off about 8 to 10 times. There is no issues of any kind other than that. I have unpluged bcm, water temp sensor all fuses and relays. The only thing that basically is plugged in is the pcm would be my guess. I really do not want to unplug pcm while battery is connected to see if it shuts it off.