KenLayton
In Memoriam
I've made up a drawing and picture of an adapter harness I made. This allows you to use an Ardac "USA3" upstacker bill acceptor on the Williams coin doors with the lower cutout hole. In the machines factory wired for a 120 volt AC Mars bill acceptor with the 9 pin connector, one end of the adapter harness plugs into that connector. The other end (12 pin) plugs into the Ardac bill acceptor.
Here is a picture of one installed on a Demolition Man pinball coin door.
Here is a picture of one installed on a Demolition Man pinball coin door.