hey, ive got a 98 3500 2wd chassy cab truck. has a dump bed on it. It wont start! idk what i could be. the truck starts for a second then dies. also if it sits for very long ( i mean a week or so) the battery goes dead. idk if those issues are realated. the battery thing has been going on for a while. this not starting issue just started last week. I have checked fuses, looked for anything disconected. any ideas on what to check next?