See attached pic (click for big)
Starter is a Denso 22800-3852 and I can't find a manual for it anywhere.
The grey wire comes off the top part of the starter and connects to the lug at the bottom part - I thought it was a ground at first, however it appears to be insulated which has thrown me. And I'm not sure why the top part would have to connect to it.
The positive lug is on the other side of the starter.
As to why I care: I'm running a new ground wire to the engine
, and if that's the ground lug for the starter I want to connect directly to that.