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Old 20 August 2016, 10:40   #1
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Disconnect the battery to reduce corrosion?

Does disconnecting the battery reduce corrosion on an outboard?

And if so does it matter if you disconnect the positive or negative battery lead?

Tsm
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Old 20 August 2016, 10:47   #2
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Quote:
Originally Posted by two stroke mick View Post
Does disconnecting the battery reduce corrosion on an outboard?



And if so does it matter if you disconnect the positive or negative battery lead?



Tsm

In THEORY no, it shouldn't make any difference. BUT, unless you have perfect wiring, no current leaks, perfect insulation (dry) then you can get stray currents that can accelerate corrosion. I've always had (good) battery isolators fitted to my boats. It won't hurt, I'd disconnect the +ve as close to the battery as possible.


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Old 20 August 2016, 11:29   #3
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I have always pondered apon this question and the the relation to galvanic corrosion and electrode potential
I know the anode and cathode relation ship causes corrosion and Is caused by electrolysis and maybe the simple disconnection or removal of the battery supply may reduce any further damage
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Old 20 August 2016, 11:32   #4
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if you fit an isolater +ve leg that will isolate the lot and also prevents drain if you do have a trickle going somewhere, the anodes on the engine will protect that, lift engine when not in use whilst afloat, paint coating is important too [chips down to bar metal] especially the in water bit to prevent electrolysis between dis-similar metals.
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Old 20 August 2016, 13:29   #5
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I have an isolator. When I leave rib on mooring I switch it to the off position as I have a direct lead from bat to pump. This arrangement stops corrosion in the electrics as there is no current as Mick says in the previous post.


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Old 20 August 2016, 18:43   #6
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Mick; saw you had a smaller boat. Is it on a trailer or kept on a mooring?

If trailered disconnecting the battery won't do anything to prevent corrosion. As said above it *might* if kept in the water.

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Old 21 August 2016, 01:28   #7
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Jyaski I was about to mention that my boat lives in a shed
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Old 21 August 2016, 04:36   #8
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Jyaski I was about to mention that my boat lives in a shed

Yea but you didn't mention that in your op!


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Old 21 August 2016, 05:20   #9
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Jambo

Don't take it to heart I was just wondering as I have some heavy corrosion on the lower unit where the gear selector enters the gear box

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Old 21 August 2016, 05:24   #10
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Mine lives on a trailer under a shed, but I still isolate & leave it on a permanent charger. If you use an isolator it needs to be a good one & mounted in a dry area. Bluesea in console in my case.


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