No. I'm going to test the coil with the multi-meter. It could be that the powerbox and ET coil are incompatible. The wiring diagram does show a regular coil. Perhaps the ET coil performs best with a condenser and zener set-up? You never know could just be a naff connection on the HT lead. All will be revealed.
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
Having just tested the ET coil across the + and - it's showing 1.6 ohms and 6.49k ohms between + and the HT cap. My understanding is it should be twice that. The ad on fleabay did say suitable for both 6 & 12 v although I'm starting to question that.
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
This may be stating the obvious, but if you want to "replace" the alternator with a battery, you need to do it on the "DC" side of the regulator/rectifier and isolate both the regulator/rectifer and the alternator.
I reckon the answer to the spark problem is the ET coil. The Boyer site says for use with original / standard coils. Ordered and winging it's way as I type.
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein