K, so I have been going over the wiring diagram, and I think this shouldn't be too tough, but I'd like to get a sanity check before I rip into anything. To run the game boards, I only need to take the harness that would normally got to connector 4J2 on the PS board and connect it to a switcher supplying +5, -5, +12 and -12 on the correct pins. That should get the game running, right? And since it's just the +5 on the PS board that is hosed, I can still connect it to the ISO transformer and use it to power the coindoor coils, AC lights, switches, etc from connector 4J3. I'll leave the heatsink unplugged. Will it hurt anything to have a mostly zero load on the PS board? All the logic will feed off the switcher, so even if the PS board smokes it shouldn't hurt anything. Does this seem about right to you guys? Sean