Gaylen, The ignition coils have a ripple high voltage on that "+" lead. So arcing of a fuse contact makes sense. Vibration, loose contact, inductive load means you'll see problems. Did you use any dielectric grease on the fuse contacts? I'm just tempted to use fusible links. If you wired coils with 12 gauge wire, use a short section of 16 gauge wire as the fusible link. I buy the fusible link wire from NAPA Auto parts.. Spiced, heat shrink seals. No slip joint connectors. You'll also, after some hours, may discover the same issues where the wire attach to the coils. Has anyone run into an emergency when you had to open the power to the coils? Tom I finished my first annual condition inspection last month. I have about 80 hours on it now. I had only one major issue. I used fuses to protect my wiring. I had an engine stoppage due to a fuse protecting the coils apparently arcing and eventually building up enough oxide to prevent current flow. I rewired my flight critical bus using robust aircraft circuit breakers. The fuse panel appeared normal - no apparent problems with it and the fuse looked good. It gave me a headache troubleshooting it! I finally discovered the tiny corroded spot on the fuse. I'm still using fuses on the non-critical bus.
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