Need help with no spark

Hi guys, we just got the new engine in the car and rewired the alt - ballast- coil, & ignition box with new wires and correct wiring diagrams (I hope...)...

We are not getting spark out of the coil. It's a new MSD Blaster 2, we have a MP chrome box from Jeggs, and the plug and play modified distributor with the advance limiting plate from the forum member here.

With a test light I get power at the input and output of the ballast resistor. I also get power to the positive terminal on the coil. I also get power on the blue wire at the control box at the harness, and the black when it's disconnected.

I am also getting power to the electric choke that is wired to the input side of the ballast.

This is all tested with the clamp of the test light on the negative battery terminal.

We are getting 6 volts at the positive coil terminal, with 1 1/2 volts at the negative terminal, and 4 Volts from going from positive to negative across the coil.


It won't crank over by the key, but we have to turn the key to on and jump the starter relay to get it to turn over.

We also noticed when we turn the ignition key to off from run, we get one spark jumping off the coil center main wire to a ground (we have the center coil wire disconnected checking for spark). We don't get any spark jumping from the center coil wire to a ground when cranking with a remote starter with the key on.

How to we test the ignition box to make sure it's not causing the problem and what other tests can we do with the coil to see why we are not getting spark?

Thanks for any help and replies...