This is why your check your battery cables

I could wiggle it and get a better connection, but this was leading to my trolling motor batteries not getting charged properly.

Corrosion kills. Going to replace my main battery cable when the boat comes out of the water. I think the last time I looked, battery cable was like $13 a foot.

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Bench grinder brush is your friend

I just replaced it, cheap insurance.

You lost me at “I could wiggle it and get a better connection”.