1977 GMC G35 Vandura cranks but does not run

[pickleboat]

1977 GMC 6L Vandura cranks but does not run. Headlights do not work but running lights do. AC fan works. Was running and just died! Must be a fuseable link some where.
Any diagrams or schematics would be helpful please send. I doent know if it is two problems ignition and light switch or just one?

Thank You

 

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