I would loosen the microswitch a little. Did you just work on it at all? I have had similar problems and I think I tightened it down too hard and it would be flaky.

Also, realize the SPEED of the tests you are running. You might test the switch by throwing the ball past the switch at a different speed than the actual gameplay activates it.

Check the wire to that switch or the switch just needs some adjustment.

Hello PenguinChicken,

Are you testing with your finger, or are you testing by rolling a ball through the gate as would happen during actual game play?
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

As others have said be sure to use a ball to test. A finger will go "deeper" into the slot and will register a hit where a ball may not.

If it's a micro mini switch, replace it and be done with the headaches.

If they get gummed up inside they often work in test but fail in game play.

LTG

I had a similar problem, after every adjust it worked fine for a few days. But the same problem came back over and over again, in the end i just replaced the switch completely. My tip is replace the damn thing soon as possible, it will just annoy the shit out of you.

Did the right switch behave properly when installed in the left ramp? If so, it sounds like the problem is not the switch but from the connector back through the wiring somewhere.