i dont recomend holding bare wires together
if they are some how hooked to the coil directly
or if it is bad and is connected because its bad ...it mite do a job on you
or at least make your EYE'S get VERY BIG
i take electrical safety very seriously
holding on to 12volt wires may not get you ..
.but if it becomes a habbit
then the defective 110 to 12volt battery charger you have hooked up
some day may get you or the kick back from the spark coil
dumb things kill people
a guy i know used to use 110volt 60cycle ac in series with a 40 watt light bulb
to arm his electric fence on the farm (to cheap to buy a fence charger)
He killed 2 cows and 3 deer before he ask me why it was happening
dumb
look for some one that works on bikes with lots of electrical know how
if he is a ham radio operator even better
also there is one of the fellows on here that is an electrical eng. he may
be near you in the uk but i forgot who he is
its hard to fix things with only the electrical drawings on a bike model
i have only seen in pictures and from 3000 plus miles away
i am not the head electriconics officer on ncc1701
just the FTG-3 from the LKA 54 USS ALGOL /1967/1968