somthing is killing my battery and no one can find whats doing it

When the van is idling, does the battery have at least 14 volts? If not the charging system is not working. I think that there is a voltage regulator on the firewall on these, I know I have replaced several on dodge vans. Again, if you don't have 14 or so volts at idle ( lights off, no heater motor on, no radio, no wipers etc ) your battery is not being charged properly and it WILL go dead.

Did you ever find out what was doing it? Im havin the samething going on with my van put new computer in it an still draining battie