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Old 17-05-2017, 10:15   #1
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Grounding to Shaft

A previous owner had connected grounding wires from several stainless steel water tanks, bronze through hulls and a steel diesel tank to the old engine. My new engine came with a shaft coupler that electrically isolates shaft from engine. The instruction manual for the shaft coupler said a wire connection bypass is available to ground the engine to the ocean. Do I need this for my setup?
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Old 17-05-2017, 11:12   #2
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Re: Grounding to Shaft

I would say yes because it likely the only zincs you have are connected to the driveshaft / prop and to continue to protect your thru hulls you need a zinc.
Or you could disconnect all the thru hulls and isolate them, or add a zinc outside of the hull but in the electrical circuit with the thru hulls

I'd just add the jumper cause what you have has worked for how many years? Why change it?
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Old 17-05-2017, 12:22   #3
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Re: Grounding to Shaft

Do boats usually ground their entire boat through just the prop zink? I couldn't get the jumper to last in our boat, it broke. I ended up using a grounded brush that rubs on the shaft.
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Old 17-05-2017, 13:00   #4
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Re: Grounding to Shaft

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Do boats usually ground their entire boat through just the prop zink? I couldn't get the jumper to last in our boat, it broke. I ended up using a grounded brush that rubs on the shaft.


I don't know of any other zincs on the average boat.
However many boats float if that is the word their thru hulls etc. and do not bond them to anything.
On mine it seems everything is bonded, even the rigging, I have been told it's part of the lightning protection scheme, maybe who knows.
Only zinc I have is prop zinc and I think that is common, although I often hang a guppie zinc, but most do not.
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Old 18-05-2017, 03:44   #5
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Re: Grounding to Shaft

Shaft Grounding Strap ➥ https://www.marineprotectionsystems....rounding-strap
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Old 18-05-2017, 07:59   #6
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Re: Grounding to Shaft

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I'm not sure what $AU207 comes too in US, but I looked at one of those at the store and saw that I could make it for about $5. A bronze bushing cut in half, a strip of stainless steel and a piece of wire.
My viewing experience in boat yards is, most cruising boats have an external zinc on the hull.
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Old 23-05-2017, 09:04   #7
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Re: Grounding to Shaft

Thanks for the input. Made my own jumper for now. See attached pic.
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Old 23-05-2017, 09:49   #8
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Re: Grounding to Shaft

That will work, however a strap will be more flexible and less likely to fatigue over time.
https://vetco.net/products/braided-g...FVQlgQod-ckEUA
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Old 23-05-2017, 18:39   #9
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Re: Grounding to Shaft

Which engine is this?
My Volvo MD2020 has an insulating system between transmission and engine.
The manual specifically advises against allowing electrical connections between the two via shaft bonding because of the aluminum water cooled transmission case.
I bonded my thruhulls but have a shaft saver disc between shaft and transmission.
( I typed tranny, but you can't say that anymore ! LOL, or is it GRRR ! )
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Old 23-05-2017, 18:57   #10
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Re: Grounding to Shaft

My new engine is a Beta 38. I will test trannie case with magnet. I think it's cast iron.
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