Get your multimeter.

Set it to 20v DC.


Stick the black probe of your multimeter into the ground pin hole of the neon connector plug on the pinball machine and the red probe into the 12v pin hole of the neon connector plug on the pinball machine.

Switch on machine and go into:

System Menu
Diagnostics
Solenoid Test
Scroll through the menu and activate solenoid 41 (the neon).
Close the coin door

Check the reading on the multimeter to see if you are getting output voltage.