Yours is newer and they may have changed how they do the brake grounds. It seems that they did modify the battery ground to frame, frame to converter path after I posted my mods. Or not.
My brake grounds went to ground on the frame, one for each axle. I also found a wiring connector problem that needed repair. I've run a ground cable from each ground point to a stud where all grounds connect, lug to lug, including one to the battery. You can see in the photo of the ground stud, just above, that the original hole already has rust where the screw attached one of the grounds. All connections were then coated with electrical tape.
Ron