In looking at the rear interlock switch, there are two of clips that appear to be broken off. Maybe those are the wires that would have gone to the front interlock?
Bingo...... and I was busy writing when I got beat to the rest of it.
But here goes anyways.
As for the interlock switch:
Quit tracing the smaller wires...... the interlock is part of the main power, which is the LARGE black and white wires. The interlock switch wiring does NOT go back to the PCB.
I don't think this was damaged during the vandalization since it should have been mounted to the cabinet itself, not the door. The lower coin meter is what actually comes in contact with it in order to activate the switch. And the picture of your wiring harness in that area seems to be "loose" like it has been into by someone. So maybe they removed and bypassed the switch even further down the line.
Is there still a back door interlock switch?
Also the fact that you say it fired up when turning it on leaves me to believe it's been bypassed. The interlock switches are there to prevent the machine from turning on unless all doors are shut.
If you have a red LED lit on the "white" (deflection) board next to the monitor then that means the "spot killer" is on. Which means there is either no signal from the game or the monitor itself has a problem. (most likely the monitor) Check all the fuses on that white board and let us know what you find. (don't mix them up though)
The clicking from the coin slot area is probably the coin lockout coil powering on.
It prevents people from loosing money if they put coins in the machine while the power is off. Basically the coin will just kickout through the coin return instead of going through the coin switches.
The only other thing that might "click" on the coin door is the coin meter. Turn the machine on and see if the number changes.
In the pictures I posted you can see the two smaller gauge wires that you were questioning and just how close the interlock wiring
should be.
So if they were there in your cab, then they should be pretty obvious.
You need to check for the back door interlock and then also investigate what might have possibly been changed further down the line towards the power supply and wall plug.
Sorry for the crap pics, but the sun was blaring right into the front of my storage building where this cab is.