When ever its totally dead I have it fully charged and tested at auto zone which usually takes around an hour.
Now the truck does sit because it is a project truck and Im beefin' it up
buuut I do get out there everyday to start it and take it around the block kind of a deal.
By charging system do you mean the alternator? Im going to tear that out next and have it tested as well.
Also I just took it out and when I was driving the volts kept going down and down and down??!! Im thinking whoever wired the tach did it wrong cuz it freaked out while this was happening? May be a multi-problem issue???