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Thank you, I agree with check easiest first. I have continuity from post R at the plug through the bulb to ground.

Hello, I have a 1970 M20F and my “gear up” annunciator light does not work when the test button is pushed. I am looking for a wiring schematic for the circuit board located behind the test button. Thanks

I have had the plane for 7 years and has always been an issue but has slowly gotten worse. I had the left mag, starting switch, and starting vibrator rebuilt in 2017 chasing another problem that turned out to be a short that was easy to see on the P wire at the left mag. checked the plug wiring found it OK. pulled the starting vibrator and found the contact points deeply pitted in one spot on lower point and a raised area on the upper point. cleaned them up and looking for a new set of contact points. Aircraft spruce is out of stock, in case anyone has a suggestion on where to get them. Thanks for all the help and ideas. She starts better and I think I have to really work on my technique to prevent flooding the engine. I hate listening to that starter work so hard.

Hello all. first time on the site. I have a 1970 M20F that i have difficulty starting during hot weather and short stops.