1. Safety First:
* Disconnect the battery's negative terminal. This is crucial to prevent accidental shorts and shocks.
2. Accessing the Ignition Switch:
The ignition switch on a '79 Corvette is typically located under the steering column. You'll likely need to:
* Remove the steering wheel: This usually involves removing the steering wheel nut (requires a special tool or socket), then carefully pulling the wheel off the shaft. Be aware of the possible presence of a retaining clip or bolt beneath the wheel. Take pictures as you go!
* Remove the steering column shroud/trim: This will expose the ignition switch. You might need to remove some screws or fasteners. Consult a repair manual (see below) for specific instructions.
* Possibly remove the turn signal switch or other components: Depending on the model and its specific configuration, you might need to detach these parts to access the ignition switch completely.
3. Removing the Ignition Switch:
Once you've accessed the switch, you'll likely find it held in place by one or more screws or retaining clips. These vary by model and year, so a repair manual is vital. Carefully remove these fasteners. You might find the switch connector is difficult to reach.
4. Testing After Removal (Important):
* Don't just assume the switch is bad. Since you're already getting 0 volts at the starter wire *after* disconnecting it from the switch, the issue is upstream. The ignition switch itself might be fine.
* Trace the wiring: Use a wiring diagram (a repair manual is essential here) to trace the power path from the battery, through the ignition switch, to the starter. Look for broken wires, corroded connections, or other issues. Check fuses and relays in the circuit.
* Use a multimeter: With the ignition key turned to different positions (start, accessory, run), systematically test the voltage at various points along the wiring path. This will help pinpoint the fault location.
5. Replacing the Ignition Switch (If Necessary):
If after thorough testing, you determine the switch is faulty, you'll need to replace it with a new one. Installation is typically the reverse of removal.
Important Resources:
* A Repair Manual: This is absolutely essential. A Chilton's or Haynes manual specifically for a 1979 Chevrolet Corvette will have detailed diagrams, procedures, and torque specifications to guide you through this process safely and effectively. The manual will show you the exact location of the ignition switch, how to remove it, and the wiring diagram.
* Wiring Diagram: Even with a repair manual, it's helpful to have a separate wiring diagram to more easily trace the power path. You might find these online (be wary of their accuracy) or in a specialized Corvette forum.
Why you're reading 0 volts: The 0 volts reading at the starter wire means the circuit is broken *before* the starter. The problem might be a bad connection, a blown fuse, a faulty ignition switch, or a problem in the wiring harness leading to the starter. The ignition switch is only one component in a system, and it's critical to diagnose properly before replacement.
Attempting this repair without a repair manual is risky. If you're not comfortable working with automotive electrical systems, it's best to take your Corvette to a qualified mechanic.
