I will ground the gonzo separately direct to battery. This was considered in my troubleshooting at one point but i ruled it out as the components had no issue before with this exact wiring. The schematic I should have been more clear with wire crossover depictions. The power supply is run to the gonzo of the main power harness. It is not a part of the coil "trigger". The only wire from gonzo to coil is the ground trigger
I am no expert ..and can have wrong But as a suggestion to think about.
I put it here for safety's sake so we are at the same page I can be totally wrong here it depends on the internals of the box
and for others to intervene
I believed that the Gonzo box got its power via the Red/White Kill SW vertical
At the same time the coil got its power on the same wire . horizontal Coil+ Red/ White
Driving a current to orange .that may or may not be to ground all the time ( I believed it was according to Team Junk going to ground not certain
it depends on the Black box so to speak )
Then at the triggered moment ( can be wrong again ) the Red / White is grounded not in the Kill SW but in the gonzo box
Making the Potential the same on both sides of the coil namely ground and no current any more through primary winding and then firing
the spark in secondary winding.
So if one takes the power + 12 V from the Battery instead of from the Kill SW it must also go to the Box for triggering ./ grounding
If this is correct so far then the 12 V from Battery .
Battery for reducing ripple and spikes . And preferably not from a wire somewhere in the harness that can have these distortions
And act as an antenna as well.
goes in at the connection between horizontal and vertical and the part to kill Switch is disconnected.
And the ground black down at the right corner Gonzo goes to Minus at the battery .
So 2 extra wires from Battery ... There are the Usual 2 ones +and - minus and one extra ground - to the Box Ground
" Ground Black "
and one extra power 12 V to the coil and box. goes in at the connection between horizontal and vertical
As a suggestion to think about. I have not done the read up can be wrong but the extra ground wire has proven a good thing
a solution In
Close to ten cases I know of.None Gonzo though.
The + 12 V has not been important and later removed getting power the regular way .But can make sense at a fault finding stage
Trying to get the correct physics as far as possible.