Ground Wire Between Both Motors
06-01-2011, 11:09 AM
#3
artselectricinc.com
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A common ground between engines is a must. It should be the same size as your battery cable. I think that it is a CG regulation to do so. It will prevent smoking a small ground wire if you loose the main ground while cranking your engine.
06-01-2011, 11:36 AM
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06-02-2011, 11:10 AM
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If you have "1-Both-2" battery switches that allow you to power either engine with either battery, you must have a heavy-gauge ground connection between the engines to carry the starter current. That being said, some boats use a grounding/bonding plate where all the battery and engine grounds come together. That will serve the same purpose.
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06-02-2011, 12:56 PM
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06-02-2011, 03:20 PM
#8
artselectricinc.com
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Apparently it is a coast guard reg. Also it is common sense. As I stated in the above post you can melt a wire and potentially start a fire if a main ground is lost during cranking. I own an auto repair shop and have replaced more than one clutch cable because of the above scenario.
