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Do you have 12 volts to ground on the small wire on the starter solenoid when you turn the key to start?
If not back up till you find it.
If so, do you have 12 volts on the big wire on the solenoid.
If you have room, get a remote starter button and hook across the big wire and the little wire and see if it turns over when you push the button.
With the key on, it should start off the remote button.