Easy way to check draw.Close doors make sure nothing is on.Disconnect neg cable.Attach test light to neg cable couch other end to neg terminal.Should be no light or super dim as computer,memory etc darw a bit.As for batterys being 4 or 5 years old and needing replaced thats bull.Last one in the 04 Ram was replaced last year.The one in my 65 was at least 8 years old.Not saying its not bad but could be.As for running bad they will with low battery voltage and or not charging right.That and they have to relearn after battery goes dead/low.Best to charge it and take it to say Advance or AZ and have them check charging and battery.Its free.Rocky