I have a Bally Vector machine and the start button no longer functions. It not only will not start games, but also doesn't operate in the tests sequence. I've tested fuses in the bottom of the machine and they seem fine. I tried testing the switch behind the button and believe this may be the issue. With the button pressed, I show no resistance when I test the post coming out of the bottom of the switch (see photo). However, I am not able to make a connection when I test the post coming out of the side of the switch (see other photo). These two posts are connected by a resistor. I may be on the wrong track, but any thoughts/advice from here would be greatly appreciated!

20161203_211643 (resized).jpg

20161203_211707 (resized).jpg

Thank you, YeOldPinPlayer! Your succinct troubleshootitng outline helped me isolate the problem and get the answer quickly! There was a spare wire in the base of the cabinet that had come in contact with a sort of mesh wire attached to the cabinet that was causing a short. Needless to say, I cleaned the rest of the junk out of the cabinet - it turns out it is not a good storage space for parts...