I have a welded stud to frame rail in trunk with 1/0 Ga. wire. Then a stud welded to left front frame rail to engine block 1/0 ga. wire. Then I have a 6? ga. wire from right rear cyl. head to cowl .
That should do it but check with a meter while cranking. You could have a bad wire/ terminal, there, and I have seen that!!!
Clip meter to battery NEG and to body ground. "Rig" so you can see it or find someone, or rig a remote starter switch. Crank and read meter. Then move meter to a good body ground and to engine block, same deal. You should have no more than maybe .1--.3V reading while cranking. Bear in mind there are TWO drops and they ADD
