I cleaned up the contacts on the engine to chassis ground wire several weeks ago.
The contacts weren't bad, and I may have cleaned them previously when I first bought the car. The chassis contact point, though, is a somewhat squarish protrusion that makes me think that the ground wire's end terminal should be U shaped to fit over the top and down the sides for a larger contact surface.
I'm running an Optima Red Top maintenance free battery rated for 800 cold crank amps. It is an AGM (absorbent glass mat) battery, I think. While I may need to get a new battery, I'll first try cleaning the battery posts well and determining if that solves the problem.
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