Disconnect the battery to reduce corrosion?

[two stroke mick]

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

[Pikey Dave]

Originally Posted by two stroke mick

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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[The Black Pig]

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

[jeffstevens763@g]

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.

[jambo]

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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[jyasaki]

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.

jky

[two stroke mick]

Jyaski I was about to mention that my boat lives in a shed

[jambo]

Originally Posted by two stroke mick

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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[two stroke mick]

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

Tsm

[Pikey Dave]

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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[uncle al]

Battery connect, make sure everything is switched of before connecting the earth cable last, always keep your head as far away from the battery as possible when buggering around with batteries, and don't bloody smoke near them either. Dis connecting them earth first, same safety rules apply.

[uncle al]

I used to have a piece of equipment that measured extraneous currents in the water that plugged into my multi meter, when there was excessive corrosion on obms or inboard legs.

[jambo]

Originally Posted by two stroke mick

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



Tsm

Hi mick no worries I haven't. I just wanted to say that you hadn't mentioned that in your op. Hope you find the answer. Atb J


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