Electrical issues

[4m0ntana6]

Hey guys I'm new to the forum here at gm trucks but I'm having some odd electrical issues I was hoping someone could help me with. I drive a 2006 silverado CCSB gasser and recently my truck has been sitting getting ready to sell. Well long story short I'm driving it again and will be for a few weeks while my other car is in the shop. When I first got in the truck everything was fine but I noticed the blower for the heater was not working but the display on the heater control and everything was. Driving down the road for a while it all of a sudden kicked on but has been sort of sluggish in responding to the controls. Also, I noticed the radio and everything was not shutting off when I opened the drivers door. I had to use other doors to turn everything off. Well last night I turned off my truck and the display for the heater controls turned off the the blower was still on and my gauges were still lit up and radio was still playing. It would not turn off no matter what door I opened. I figured it would all turn off with time as the radio usually does but I woke up to a dead battery this morning. From a little research I found it could either be a stuck relay, a bad door switch, or the resistor for the blower motor is shorted (something about cutting a purple wire)? Any help would be greatly appreciated. Thanks!

[Formulabruce]

Ground issue. Try engine to firewall, and look for other grounds to clean up. Most likely a BCM ground under the hood.. There is one on the pass side firewall I believe. Your truck is seeking alternate grounds, which "keeps things sort of Alive"

[4m0ntana6]

Okay I will look into that. Thanks for the quick reply!