A bit of history on the machine might help.  Did you get it DOA?  Are there signs someone has tried to fix it and failed?  As I said, connect the SDB up with none of the coil plugs (large pin plugs) connected.  If this blows the transistors, you know you have a board problem.  If not, you need to look downstream.  Coils are not polarised, so it is the orientation of the diode that determines which side the common (usually yellow) wire goes on. 

Resistance probably means nothing - diodes and transistors are tested using the diode setting on your multimeter.  Have a read of the PinWiki:  http://www.pinwiki.com/wiki/index.php?title=Bally/Stern

cheers
Ian