A '78 Bonneville will probably require two 6V coils-unless they have already been changed from the original 12V because of a previous EI installation?

Im a sparky by trade ,and have been fairly carefull with the fault finding .
Both Boyers went with burnt pickup coils and as I've said the trispark was probably my own fault .
the new one is running like a dream .

I just completed the installation of a new Tri Spark Classic Big Twin unit on my 74' 850 Commando and am more than pleased with the results. I replaced a crappy Boyer (with broken wire syndrome and low voltage issues) and it turned my bike into a ultra-reliable, easy-starting, smooth running motorcycle!

I can now ride at distances more than a 5 minute walk from my house and can shut the bike off and restart it with one kick every time!!

I find it hard to believe that Boyer remains in business manufacturing, IMO, sub-standard products as documented by numerous complaints in this forum..They obviously don't know about or read posts about their ignition problems in Access Norton!