Found a burned up chime coil in Spanish Eyes. Upon investigating I disconnected the coil and measured the voltage to the coil (unterminated wires) and there was correctly 26V when the 100 point or 1000 point switches closed, but with the switches open I measured about 12 volts. I have checked the continuity from the chime coil lead (B-G) to the yellow (power) wire and when the relay switches are open there is no continuity. Why am I reading 12 volts on this open circuit? Is this some kind of induced voltage due to the wiring, or what?

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Does this answer your questions about where I measured the continuity and voltage? I am measuring 12v at the wires that would otherwise be connected to the chime coil, but I have it removed.

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Induced voltage can occur when wires are merely in close proximity a hot conductor in an AC circuit. My question, to others: have you ever seen this in your pinball machine?

When the switches are open, I confirmed there is no current flow and I measure about 12VAC to the coil. OK, so I received the new coil and installed it and everything is working fine. I'd never seen induced or phantom voltage like this before. I wonder if it has anything to do with me installing a 3 conductor power cord and grounding the neutral.