First of all, the resistance check of grounds is not an absolute test. Checking voltage drop( difference from one ground to another). The reason for this is this: you can check a wire with one strand left, and show zero resitance, but the one strand cannot carry any current, rendering it bad.
From battery to block
from block to frame
from frame to body
NEEDS TO A CONTINUOUS LOOP
Make sure the grounds to all of these points are of sufficient size-we use 6 gage or better.