Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Is the single fuse in the wire from the starter solenoid, back to the key switch good? Do you have a voltmeter to check the battery and connections? Have you cleaned battery cable connections at battery? Do you hear the solenoid at the carburetor click when you turn on the key? If not, battery is dead, or the fuse is blown.
Looks like on the Bronco, the battery is under the seat, so usually the battery has to be removed to access the fuse, which will be near the starter solenoid, which is at the end of the positive battery cable, the fuse comes off the same post, the battery cable is bolted to.