injector harness ground?

im trying to trace my ground for the injector harness,what color is it?where does it start and stop,and can i manualy ground it to the battery to see if thats my problem.

i have correct pressure in the rail,but injectors not firing.replaced the control module,pressure regulator,fuel pump,bypassed the inertia switch.i can hear my relays kick on and off with the key.i still have no gas to all my plugs.funny thing is that it starts once in awhile(once every 2 days or so after sitting.after you shut it off....it just cranks with no start or gas to the plugs,until the battery dies.