Ok, I just completed this modification, now the truck wont start. Its a 78 W200 with 400 BB. I have traced out all the wires and I get voltage all the way to the distributor. The engine turns over, but as far as i can tell there is no voltage at the plugs. I ran a ground wire to the distributor as well. How much voltage should i be getting at the cap from the coil? Its a new cap, rotor and the distributor looks fine. Anyone have any ideas?