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Tan, MerCruiser Certified Technician
Category: Boat
Satisfied Customers: 11077
Experience:  40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.
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What can cause the positive battery terminal in parallel

Customer Question

What can cause the positive battery terminal in parallel connected batteries to completely corrode away?
Submitted: 1 month ago.
Category: Boat
Expert:  Tan replied 1 month ago.

Hello, I'm Tan. Welcome to JustAnswer. I'm reviewing your question and will reply momentarily.

Expert:  Tan replied 1 month ago.

Salt water corrosion loose connections will cause extreme corrosion . If the terminal was loose the cable end could have gotten hot enough to melt the cable ends. Lack of maintenance of terminals they do corroded. Can you post a pic of the terminal.

Expert:  Tan replied 1 month ago.

Here's an image of typical corrosion.

The reason one battery can corrode more than another is the health of the battery. If the battery has a weak cell that battery will get hotter than a good battery producing more gas and the corrosion.