Key switch to disable electrics & starting

I am not very good at electrics either but I did approach it differently than you are attempting.

I started down a path with my new 06 FS650e which involved picking up KTM SMC parts to graft onto the berg for a street application. Part of this was the SMC keyed ignition barrel which is an on/off with two sets of contacts both of which are open on OFF.

Ideally the iginition barrel would have been such that on OFF one contact was closed and the other open, when ON the contacts would reverse their state. With this I could have used them this way:

OFF Position
Contact 1> Closed - used to gnd yl/bu CDI lead
Contact 2> Open - used to interupt 12v power at fuse block

ON Position
Contact 1> Open - ignition grn circuit open
Contact 2> Closed - 12v power circuit completed

In fact what I ended up doing because of the switch layout was the following
Off Position
Contact 1> Open - used this to interupt grn ignition pickup lead
Contact 2> Open - used to interupt 12v power at fuse block

ON position
Contact 1> Closed - pickup circuit completed
Contact 2> Closed - 12v power circuit completed

Subsequent investigation suggests that the SMC's use a CDI interupt vs the more conventional CDI to gnd hence the less than ideal layout of the switch for a berg application. A dualsport EXC switch would likely have been a better choice in my opinion, based on my cursory review of their wiring diagrams.

Cheers

Mark