03 Duramax Help needed

[Packer]

I have an 03 Crew Cab LT. If I let my truck sit for a couple of days, when I go and start it the radio always resets. The passanger side battery went bad on me and got it replaced under the warrenty of the battery. If I use the truck every day, it doesn't reset. Only after it sits a coupld days.

Any sugestions on what I might want to check?

 

[AZ800]

Doesn't sound battery related if the truck still has power every time, but the radio just started taking a sh!T in my 02 Dmax, radio reception is getting progressively worse. Maybe a short in the contiuous power wire to the radio, or the ground on yours?
Also, it's best to replace the batteries in pairs, unless they were pretty new to begin with. Old batt tends to drag down the new one. Also, the side post GM style tend to lose contact more easily, in my experience due to corrosion or threads stripping out in the batt.

 

[Himark]

disconnect one batter and put a meter on it. Then see what the draw is and start pulling ONE fuse at a time and replace it while someone watchs meter. If you find a drop in draw you found your item that is drawing on them.