Ground wires

Front of cab has several too.

 

What year is it? There's the one at the engine block, which also goes to the frame. That's the main ground to the chassis. As KB stated, there's multiple grounds at the front of the cab, near the steering column. Are you only looking for chassis grounds, or every ground circuit in the truck? If you give me the year I can get you a schematic.

 

Fusible Link From Block to starter and one from Starter To chassis One from Starter to Batteries and another one to the cab harness from starter as well, and a few different ones up to the cab on top of steering shaft

 

look for 6 mm ground lug on pass side of firewall

 

Engine block to frame
Starter to frame
Top of engine to frame
Starter to first battery
Starter to last battery
Frame to last battery
Engine harness to battery
Truck harness to battery x 2
Cab to battery
And i didnt add any, it came like this.

 

I have an 08 and I changed out two ground straps and cleaned the rest that were still in good shape. Time consuming task but well worth it. It cured a bunch of electrical problems I was chasing