Mercury 500 Thunderbolt Wiring

MooserDvrv96

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Joined
Oct 18, 2020
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I recently purchased a boat with a 77 500 Thundebolt. The engine run runs great, but I noticed that there were a lot of wires that were running from the engine going nowhere. One in particular that I noticed was a Green/Yellow wire, which i assume is the AC ground. Where is this typically attached to once it leaves the engine?
 
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