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I will replace my original keylock/circuit breaker with a simple on off key switch and then add a resettable circuit breaker. I need to know if I should locate the breaker before the key switch or after it.

No reason to not locate it as close to the starter (battery) terminal as possible.

Curious if your car has stock wiring and components. If so, from this AEA drawing, it looks to me like the circuit breaker is a separate item and only protects the lights and a couple of other things. The ign sw only controls power to the coil assy and it along with the circuit breaker looks to be powered directly by the battery but after the battery voltage and current passes thru the ammeter. Placing a CB anywhere in that feed wire would kill power to the coil and engine would stop if the lights or anything else should present a problem. Protecting the ign sw and coil is fine if you want to do that but I would add a second breaker and split the circuit so one breaker tripping would only affect a part of the car.

I will not be using the original key/coil setup. I intend to replace it with a stand alone coil and a separate ignition key. I feel inserting a circuit breaker at point 1 or 2 or both as shown in my poor drawing. What do you think?

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