Be careful when checking open switches in an EM... just check them closed for now.
Reason being that it could be connected to a coil or another switch further down the line and the meter will read across these instead. You will do your head in testing open switches.

Eliminate all switches in closed positions ( in logic state) and then move on. We can tackle open switches later on

cool i thought i was losing my mind   i just checked this particular switch as it connects to the AB relay which is what i have to hit manually to get the game working. Ok have tested the wire on the stepper on top between the 2 lugs and they have continuity. will need to keep following the relays though the start sequence Gav put up involves SB relay... i dont seem to have one of them  . The manual (attached somewhere on this thread) does have a start up sequence so will follow closed switches on that.