Spark Checker

[davevramp]

I have a spark plug cleaner with a spark checker that does not work.
I would like to build a ckt to produce the spark. But I would like to have the voltage the same the mag out put voltage. Any one out built one of these before? Any do and don’ts?
Thanks
Dave

[GAHorn]

Which test device do you have? Do you know why it doesn't work? Do you have air-pressure connected? (Some older devices do not create a spark until a pressure-switch is activated. One purpose of checking is to determine the plug fires under compression and at altitude.)

[Robert Harik]

The best thing to do is to use the exsisting circuit in your plug cleaner. If you cant fix it, then copy the circuit and build another one. I have built several for different purposes( not for aicraft) and there are just to many variables. I have built a lead tester,magneto- coil -condenser tester and a mag timmer, and I built all by opening up the "real " ones and copying the circuits.