To the best of our knowledge, the Catalina 30 fleet never had early model engines (or Prestolite starters), and their wiring harnesses had much heavier gauge wire between their starter switch in the cockpit and the starter solenoid than 16 gauge wire. I can check to make sure, but I'm quite sure they (as we do in our kit which is modeled after the Catalina 30) use 12 gauge white wire in this application.
Don
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