the thick starter black is not right it goes to the mount bolt to the bell housing this makes the motor main neg bond or earth and the little black (in red ring) one was bonded to the chassis at the battery tray on my sierra thats the body or frame bond to neg or chassis earth
if you get the solinoid to pull in its going to be a dead short and fry it to bits!
as your making a loop from main pos to neg! not safe
