Dominator boyer problems

I am getting an intermittent fault with my Boyer electronic ignition.

Sometimes I get sparks when I turn the ignition off or on and

sometimes it works with no problems. I have double-checked the

circuitry and am at a complete loss. I tried taking the two wires which

go to the stator plate and putting these togethor/taking them apart.

This produces sparks continuously so it seems to me that the coil

circuitry must be good or I wouldn't be getting any sparks. Any

suggestions would be gratefully accepted. The bike was lying idle for

some five years until recently and I have re-commisioned the bike but

this missing sparks problem has me completely beat.