2003 Silverado will not hold a charge after sitting for several days

[2003ChevySilverado]

I have a 2003 Silverado and after it sits for more than 1-2 days, the battery does not have enough charge to start it. I replaced the battery back in May of this year and I believe I replaced the alternator a few years ago. The battery I just replaced, was only 2 years old and now the new battery seems to be having trouble. Could this be another bad battery, a bad alternator or another issue? This only started since I have been working from home and not driving the truck daily. The truck only had 136K miles, but I also understand it is 17 years old.

[CamGTP]

Break out the multimeter and start doing some testing.

 

https://www.ericthecarguy.com/parasitic-draw-testing/

[Brian715]

Yep, parasitic draw. Mine was on the Radio Circuit so I just installed a relay that was ignition hot only and wired it though there. The clock doesn't hold time but it doesn't die anymore.