A total electrical stop could be several things but I'd suggest looking at the easy things 1st. The master kill switch, all major gound points, the ignition (key) switch. There are many more potentials but go for the easy stuff 1st.
As far as checking for excessive engine vibration I've heard a simple rule which makes sense. With the bike in neutral on it's center stand and running rev it very slowly up to 4000 rpm and ease it back down. If the bike slides around on the center stand you may have an issue with your balancers. Can't say this is a 100% positive test but between that and chunks of black rubber in your oil screen you should get a good idea of the condition of your balancers.
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