Starter drain the battery dead???

Subject: '77 Dodge Van 318. Van runs perfect, and we have traveled through 7 states so far in it! Zero issues on the road.
Problem: If it sits for a couple weeks, the battery goes dead
Test Results: Disconnected the Negative post and put meter between cable and battery post. Shows "neg 1.9" so power is being drawn

:)
1.9 what? volts? amps?

You say you pulled the "starter cable?" What are we working with? Is this the common standard little relay? Did you pull off the "big stud" or the "square" screw solenoid wire?