Have breakerless ignition set-up on Charger 12 , Kohler k301s, it will start and run for several minutes then looses spark and shuts off. No set time it seems random and engine not hot. If shut off key it will immediately restart and run for awhile and then again loose spark and shut off. I have tested all the components as per manual and they all check OK. Any idea what the primary voltage to coil should be on this system?. I disconnected wire to switch to eliminate possible ground issue with same result. My gut says probably the trigger but can't be sure because it tested fine with batteries and light bulb.