Quoted from cottonm4:
You are going to have to divide and conquer. I am still in the process in my build. The lights wired and the switches are wired. I have not done the coils yet. I found Shawn's instructions easy to follow; Maybe I can help. Maybe I can't.
The switches are all governed by the white wires with the red, blue, black, green stripes, etc. You need to isolate if the reluctant switches are on the white/red wire line or the white/blue line, etc.
What kind of problems are you having?
Game boots. If I press start button game starts, but immediately a credit is added (so coin switch is registering), trough kicks ball to shooter lane and points just start scrolling up.
If I go into test mode all lights work, displays work as they should, and coils fire as they should. If I press the button to go over to lowest switch registering, 10 is registering...but when I check the switch physically it looks correct according to schematic and Shawn's instructions and is in fact not touching. If I press switches below 10 like the start button or the tilt bob they register. Also when I lift the playfield to inspect it my spinners register correctly as switches 4/5/9. I will need to investigate closer to see if all of the switches under 10 register or not. It was around 1 AM when I finally got the whole thing together and trouble shot until about 2AM before calling it quits.
I did convert a Stern Pinball for this project, but I completely rewired the coin door. I suspected that was what I messed up, but then I tried another Stern coin door, this one from a Big Game, and had the same issues. At that point I called it a night. pasted_image (resized).png