Despite the great variety in engineering in Yamaha's dozens of outboard motors, troubleshooting tips remain consistent for all makes and models. Yamaha offers instructions on how to diagnose and repair electrical problems in all its outboard motor manuals.
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All Yamaha outboards come with safety measures that prevent the electrical system from engaging without clear operator intention. When trying to start the outboard motor, turn the main switch to the "on" position and fully insert the engine-stop lanyard into the lock plate.
A blown fuse can prevent an outboard's starter motor from operating. The owner should remove the electrical cover and main fuse to examine the fuse's central connection. If it is broken, the fuse must be replaced. Specific fuse amperage varies according to outboard motor size; the specification can be found in the owner's manual for any Yamaha outboard.
A dirty or discharged battery could cause Yamaha outboard starting problems. Uninstall and remove the battery from its protected, dry position on the watercraft. Clean all battery terminals and charge it fully with a separately powered battery charger before returning it to the watercraft. A damaged battery should be replaced with the same type listed in the owner's manual.
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