I can send you a picture of a Pac Mac multi door I work on - I'm due back working on Rock-Ola wallettes today, I'll snap it so you have at least some sort of a guide.
I agree with the previous poster, with two changes:
1. Unplug the game
2. With your meter set up to continuity or resistance:
a. Flick the switch and look for a change in continuity.
b. pull the switch to the actuated (full down) position and look at resistance. If it is higher than an ohm, you have a bad switch.
Also, the ground on the switches should be the same, so if you can track the ground back, you know at least one of the wires. Check to see if they left any stubs so you can match color / stripes back to the origin.
Good luck.
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My games: Stargate, Reactor, Xenon Pinball
Games I manage for an arcade: Pac Man multi, Diner Pinball, Elvis Pinball, Carnival King, Rock-Ola Juke Box and Wallettes, Space Invaders, Missile Command, Super Mario Carts, Air Hockey, Battle Shark, Rockin Bowl-o-Rama, BBH, Merc, vs. Slalom, Shooting Star, Williams Jubilee Pinball, DDR, Tip It, Pile Up, Wowie Zowie (gumball), the Wacky Gumball Factory