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Disconnect clutch saftey switch and use a wire or paperclip to jump wires together. This should work if that is the problem.
Here are some pictures its #22 in 2nd picture.
Check for power at black/red wire going to switch with key in start position if none check 30 amp LAMP fuse. If good access wires at ignition siwtch both white/yellow and black/yellow wires should have voltage with key in start position if only white/yellow replace ignition switch.