Ke20 electrical problems

[devilsix]

Hello.   A friend of mine owns a ke20 that has a weird problem.  
It only make spark when letting go of the key.  When he flips the key to start it there is no spark. But when he lets go of the key there is one spark.    We have checked ignition switch and coil.   Is has a 3kh engine with electrical ignition instead of points.     Any tips?     
there is a ballast resistor att the coil.  When he turns the ignition on it shows constant 9v in on the ballast and 7 out to the coil .    Can i try to bypass it to check if the ballast is the problem?

[altezzaclub]

The ballast is there to drop the voltage when the engine is running, so its working OK. The ballast is bypassed on the 'Start' part of the ignition key, there is a 2nd wire that sends 12V straight to the coil for starting. It sounds like this wire is broken or come off.

 

On a KE70 the ballast feed is black & orange, the start feed is red.

Edited May 2, 2021 by altezzaclub