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All Mercurys are cataloged by serial number, can I get that number so I can run it and see exactly which engine you have.
That fuse provides ignition power to the key switch. Are there any accessories on the boat other than the gauges that get their power from the key switch? By accessories I mean lights, radio, cigarette lighter ect.
Hello. My name is Tan.
We need to eliminate any accessories from the key switch. You should only have the wires coming from the engine wiring harness connected to the key switch. There should be no accessories(radios,nav lights, bilge pumps cigarette lighter etc.etc.) connected to the key switch engine only related items like gauges are ok. The ignition circuit isn't designed to handle any other loads except the engine.
Disconnect all of these they should be on a separate circuit fused.