Dx a starter issue

[DobbM]

Good fall afternoon.

I'm trying to figure out a starter issue. My first thought is that the grounding isn't good enough, thus a full circuit is not there. The negative battery terminal goes to the engine (head?, driver's side), then on the other side there's a 10-14 awg wire from the engine block to the frame at the front, passenger engine mounting block. That to me doesn't seem to be beefy enough to handle the current that deals with the starter motor, but rather for all the accessories. 

I can not see the top of the starter motor to confirm that the cable from the starter solenoid has a tight connection. 

Is there a larger engine to chassis/frame wire for grounding? A braided one or something?