electrolysis

[rickmarlin62]

my mate has a stessl striker 5.5 and has had two lots of holes in the bottom of the hull...there are no sinkers or hooks lodged anywhere ..he has tested the wiring and cant find anything leaking to the hull..we are assuming the earth is coming from the engine..does anybody have any experience with this problem ???? rick

[JonD]

My mate had a brooker virtually dissolve after two years, turned out to be grinder filings under the floor.

Jon

[dunc333]

does he have a battery isolation switch ?

[rickmarlin62]

yep...the latest two holes have a black ring round them.....we are thinkin the engine is earthing to hull and creating these holes in the forward section of the hull basically where it touches the water when planning...any ideas anyone ???

[DrownNprawns]

Do the nav lights have good earth

Edited September 20, 2016 by DavidA

[Jewdreamer]

Run a positive and negative wires to everything, Don;t rely on the hull for any earth returns

Your engine anodes should then also help protect the hull

Chris

[tackleberry]

this thread got me thinking so i grabbed my multi meter and put + lead to bat + and the - to the hull

and got 14.7v motor running while i was flushing so it must be earthing through the donk is this normal

or do i have a problem .

[takethebait]

Hi Tackleberry.

That shouldn't be a problem. Your hull should be grounded, but that doesn't mean that current returning to the battery is going via the hull. There should be a return wire to do that. Problems occur when there isn't a return wire, it's broken or has a poor connection.

What you measured was the potential between the positive and the hull in a path that doesn't usually occur.

But I'm just a hack, so check with your mechanic next service.

Cheers.

[tackleberry]

yeah i did some more checking and its ok i did all my wiring the right way with earth wire return .