Power - Start Troubleshoot

[Joe]

Greeting all. After a long 7 years I picked up a 2003 H2 over the weekend but it didn't take long to run in to a problem.

All was good when I picked it up (Sunday) including a good 120+ mile drive home with several stops along the way.

However this morning my wife went out to find the truck key fob did not seem to work so she manually unlocked the door and tried to start the truck and it was dead completely. Key also locks in to ignition.

I get home and have a look and sure enough it is dead. No power for anything including odb scanner.

Previous owner just put a brand new battery in. So I hook up a charger to it and battery does appear a little low but not enough for No Power at all. Once on the charger it at least powers up enough for me to get the key out but gives me a clicking and a bunch of chimes from the dic. Switch to jump start and get it started. It's been fine ever since. No signs of issues. Battery shows normal and no obvious drain.

Now my first thought was battery but oddly it's new as I mentioned and also seemed to have a charge when it was bone dead. Next I'd think starter but not sure this would result in a totally power dead truck, just no turn over.

Any thoughts? Going to monitor the battery and see what happens. Oh, all connections at least to battery seem tight and good. Truck threw one code p1518 I recall but pretty sure this is just a low voltage code and nothing specific enough to go by at this point.

Thanks in advance for any thoughts
Joe