corrision in frsh water

[Spoonriger]

i have a aluminum boat with a mercruiser and a tohatsu kicker and both motors are corriding on the lower unit someone said that the battery has to be grounded to the aluminum boat anybody shed some light on this.

 

[Davem3]

Re: corrision in frsh water

sounds like brackish water to me, where do you use it???

and whatever you do , do not ever ever ever ever ground the battery to the boat!!!!!!!!!!!!!!!!!!

 

[jdlough]

Re: corrision in frsh water

How are the motors' sacrificial anodes?

 

[Thalasso]

Re: corrision in frsh water

i have a aluminum boat with a mercruiser and a tohatsu kicker and both motors are corriding on the lower unit someone said that the battery has to be grounded to the aluminum boat anybody shed some light on this.

#1 do you leave it in a marina?
#2 Is shore power used on it?
#3 Do you leave a auto battery charger hooked up and chargeing when you are not there? which is a no no because auto and marine chargers are diff.
Your drives should be bonded to the negetive side of the battery. Do not ground the battery to the boat and think this is ok.
If you trailer your boat and don't leave it in the water for extended periods, anodes or the lack of the right ones are not the problem.Fresh water = Magnesium. Salt =Zinc. and brackish=aluminum.This is usually a sign of electrical leakage on yours or someone elses boat near you. A galvanic isolater helps to control this.

Google galvanic corrosion. There is a ton of info out there and what causes it and how to handle it.

 

[Home Cookin']

Re: corrision in frsh water

are your motors in the water while not in use? I can see the main dipping in but not the kicker.

Also, get a battery switch. you can often have electrical "leaks."

I have an old rig that was having electrical issues. I accidentally left the key on overnight (motor down, salt water). Motor was covered with crystals the next day, and battery dead. Freaky.

 

[Spoonriger]

Re: corrision in frsh water

use it on lake chautauqua fresh water only boat is in the water 6months of the year,zinc look fine

 

[Thalasso]

Re: corrision in frsh water

Well i guess you didn't google galvanic corrosion. Do you know what you anodes are? My guess you don't. They need to be Magnesium not Zinc .My drives are original and been in fresh water for 7 years (6months at a time). I have absolutly no corrosion. Go read about galvanic corrosion and you will have a better understanding of how it happens and how to protect against it.No one on here can truthfully help you because they don't know the conditions of where and what your boat is subject to.I know that lake.