2011 KW T800 Starting issue

Sorry don't know nothing about depopulation, although we could use some around here

 

I think they are talking of the 2 wires that run to the over/heat switch on starter not the depopulation wires? when the starter is spun longer than normal the heat sensor at end of 2 wires it will cut power to starter till it cools down to preset temp

 

On a Freightliner I had, the starter would drag (turn over slowly) at times. It was a loose ground on the frame.

 

How are your batteries wired? I have four batteries, and they're wired two per bank. If you have a dc disconnect switch on each bank, try bypassing both switches.