it's adding extra wiring to these three places
Alternator Positive to Battery Positive
Battery Negative to Chassis
Engine block to Chassis
For best results, use the biggest wire your budget can afford. 1/0awg is the best idea.
Most people use a fuse on the positive leg (for 1/0 use 200-300A). It's not required, just a good idea. Clean all of the surfaces with sandpaper for the best connection possible.