Engine/Transmission (1994 - 1998) Electrical draw while parked.

[Farmer 01]

I have a 98 quadcab that seems to have a electrical draw while parked that I can't find. I purchased a 05 this spring and left the 98 parked for quite awhile. When I got ready to get it ready to sell it would not start so I put two new 1000 cch batteries in it. But now if it sits for any length of time there isn't enough energy to start it. I checked for left on items(glove box etc)but to no avail. Can anyone help