SCH is fine, and I only filled in the BB for fun.
Sorry L1 is only a single strand of open-ended wire that I wrapped 20x around the outside of the ignition lead and only gives out about 200mV on my Ebay DSO138 scope.
When I move D1 I see the wires are crossed, do I just rotate the diode - keep cathode to GND -.
Timing_light_new2.fzz (11.0 KB)