06/23/2026
This is one of those things that made me go “why didn’t anyone tell me this?”
When a battery stud fails and the top post reads fine, the issue is almost always caused by internal corrosion, over tightening, or a broken internal connection that links the two.
Because a battery’s internal lead strap connects to the top post first and then branches off to the side stud, the stud is highly susceptible to losing electrical contact if that junction fails.
Running off of the post might save that battery for a while! Having good testers, keeping things clean, and a bit of knowledge can make owning a boat a lot easier and less expensive!