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Mounting transducers to a aluminum boat

Old 02-25-2012, 12:53 AM
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Default Mounting transducers to a aluminum boat

I just bought Lowrance's HDS 7 w/structure scan, in the installation instructions it says not to mount transducers directly to the transom of an aluminum boat, due to electrolysis. I'm just try to find the best way to mount my two transducers to my sea ark. I am debating using starboard. Any thoughts?
Old 02-25-2012, 01:31 AM
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I would like to meet the person who wrote that & ask him for the science behind that instruction.
However, you do need some type of stand off so that you are not drilling a bunch of holes into your transom trying to find that "sweet spot" for your ducer but that is as far as it goes. A welded-on hat fitting where the slide mounted TM260 is attached is one solution. There is no electrolysis issue unless you have used the boat hull as your ground, as you do with motor vehicles. You will have problems if you have done that.

Go here:
http://www.aluminumalloyboats.com/

Last edited by peterbo3; 02-25-2012 at 01:52 AM.
Old 02-25-2012, 08:39 PM
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I bought a sheet of HDPE off of amazon, and then cut it to size and adhered it to the transom with marine goop. I then drilled the tranducer bracket into that.

Its been holding up fine for the the past two seasons.
Old 02-25-2012, 10:36 PM
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SternMate works.
Old 02-26-2012, 03:26 AM
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The are 2 really good products to use when putting stainless screws or bolts into alloy.

They are Duralac and Tef-gel. Both create a barrier that help prevent electrolysis between dissimilar metals.

I think that the issue the OP was referring to was the stainless bracket for the transducer being attached to the alloy hull. Good practice would be to use some kind of inert material such as plastic between the 2 surfaces, but you would usually still have ss screws into the transom as well. A good coating of Tefgel or Duralac on the screws before they are put in will do the job.

I've personally used the Duralac on all ss fittings on my alloy boats for over 20 years with great results.

Cheers
ML

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