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Most outboard motors over 10 HP (7.5 KW) have electric start and come with a wiring harness. By hooking up the wiring harness and connecting it to your instruments, particularly if you have a tachometer, you are grounding the engine. One of the wires in the harness will be hooked to the ground (GND) connection on the tach or on another instrument. If you don't have a tach there are other ground points on the instrument panel.
On boats the usual ground connection is made by connecting the battery negative to the engine block. As explained above with most outboards this is done through the wiring harness. If you have a small boat without instruments, or a wring harness you can run a wire from the battery negative to the engine block. Do not connect this to the cowl, cover, or lower unit. It needs to be connected only to the engine block. Otherwise you could have stray current corrosion problems.
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