Any techs in the group that can help me solve this problem? I installed this new coil. It is receiving 37 volts, but it doesn’t fire when the slingshot switches close. The pads on the switches were cleaned. I have been able to ground out the coil and cause it to fire at the coil and at the transistor on the driver board. What am I missing?

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The game is Tri-Zone, Williams system 6. The coil was burnt up when I got the game (see pic). I purchased new boards for the game after trying to refurb the original battery acid damaged boards. I just tried the switch test, which I didn’t try before, and it is not registering, so that must be the problem. The switches do register when closed on the multimeter, but the game is not reading the closed switch. The last pic is the transistor that controls the coil on the slingshot.

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I checked across the matrix and all switches on the same row and column as the right slingshot (kicker) work. I then noticed that the wiring to the switch isn’t white and gray as specified by the matrix. I then found a loop of string on some black wiring, the same color as what is on the switch. Seems related, right?

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I’m lost on this... turns out the white/gray wire runs to the scoring switch on the solenoid plunger, so I think the wiring is ok. I picked up a logic probe, but I haven’t been able to determine how to diagnose this issue with it.