1991 Suzuki GSF400 will not start, I think the signal generator may be bad, any ideas?

This bike ran fine yesterday no problems at all, then today it would not start at all!! I pulled the plugs and got no spark. I find it hard to believe that both ignition coils could go out at the same time so I'm thinking signal generator. Any way to check that real easy? Any other Ideas? Thanks for the help!!
 
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