I got the van started today.

Tried to jump with cables,but it did not start (this is the first time my
hot-start, now cold start problem was not solved with a jump)

Tried banging on the starter, and it started right up.  Wondering the
following:

1.  Does the banging on starter indicate any particular problem? (Faulty
ground, solenoid or starter?)

I noticed that the red and black wire going to the solenoid (and held on with
a plastic connnector) seems to have some corrosion on the metal, and that
what I assume is the ground (post on solenoid, wire down to starter) is caked
with dirt and corrosion.

TIA,
Peter , His Family, and Zippy.