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Is this ignition on the dash or the steering column?
Hello , my name is Joe
I have read your post , and will do my best to help.
I am assuming that your coach has the standard GM in-dash style ignition switch with the round chrome bezel.
1. Turn ignition switch to off position and leave the key in the switch. 2. Disconnect the battery. 3. Take a small diameter. paper clip and insert it into the small hole in the face of the ignition switch. You will feel a small button that you depress. 4. While depressing the button, turn the key to the accessory position (counter clockwise) and using the key remove the cylinder. 5. You can now remove the bezel by unscrewing it CCW. 6. This will allow you to remove the ignition switch from the dash and disconnect the wire harness plug from the rear of the switch. 7. They don't always come apart easily , and may require some Jiggling of the key and the wire.
See the attached picture
I hope this helps you out , please let me know if you still have any concerns
Just checking in to see if you need any clarification on something which I stated above. Please remember to rate my service, so I can receive credit for my help. -Joe