The engine compartment wiring harness has several fusible links. The same size wire with a special hypalon insulation must be used when replacing a fusible link.
The links are located in the following areas:
A molded splice at the starter solenoid Bat terminal, a 14 gauge red wire.
A 16 gauge red fusible link at the junction block to protect the unfused wiring of 12 gauge or larger wire. This link stops at the bulkhead connector.
The alternator warning light and field circuitry is protected by a 20 gauge red wire fusible link used in the battery feed to voltage regular #3 terminal. The link is installed as a molded splice in the circuit at the junction block.
The ammeter circuit is protected by two 20 gauge fusible links installed as molded splices in the circuit at the junction block and battery to starter circuit.
Other things it MIGHT be are the ignition switch, located on top of the steering column:
The other thing it MIGHT be is a faulty ignition cylinder (where your key goes into to start the K10).
Check the wire harness on the steering column also.