I went out to the airport today to install a Tiny Tach on my Kitfox IV 582 Gray head.. The Tach works fine but when I did my run up I found that when I turned the switch to left mag it shut down. Right mag is fine. I thought maybe the TinyTach was the problem so I disconnected it. Same problem. I did confirm that that in both position it is running on both ignitions. I am leaning towards a faulty switch issue but did not have time to tear into it today. Any help and or suggestions would be appreciated. Thanks for your comments.

Pieter