Data east flipper boards can be trouble, mainly caused by the playfield being lifted up and down. Check the board to make sure that the playfield hasn't taken out or knocked off any parts.
Will confirm wiring tomorrow for the credit.
Hang in there.
Thanks Humpalot....
No obvious signs of damage on flipper board. Unfortunately Simpsons is a different revision so I cant put it in to test....
I have ordered some new flipper leaf's too. I'm not at home to check but should these have diodes on them too?
Whilst your looking at the flipper board check fuse clips and resolder the header pins.
I've attached a photo of the start button showing the wiring on my machine. On the start mirco switch the wires go: WHT-RED to non band side of diode NC 2, green wires to NO 3, diode banded side goes to C 1.
