Quoted from songofsixpence:So I'm trying to understand the wiring myself. If I understand correctly, the flippers are powered from J902 from the Fliptronics board.
The flippers are powered from J907 and controlled thru J902.
pasted_image (resized).png
Quoted from songofsixpence:J107 on the driver board is the power for the slingshot coils.
Correct. J107-2 (Violet-Orange) and they are controlled thru J127
Quoted from songofsixpence:J107 on the driver board is the power for the slingshot coils. With J902 plugged in, and J107 unplugged, neither the slingshots, or the flippers energize. I would expect the flippers to work in this situation.
If everything was working correctly I would agree.
You will want to check your under playfield wiring and verify the wire colors attached to the slingshot and flipper coils matches the diagrams.