No juice from MSD box

StrokerScamp said
Has it ever run with the current distributor? If it's a Mallory Unilite, you need to index that distributor or it'll never fire. There's a thread around here somewhere on how to do it.

My Mallory Unilite indexed just like a factory dist. I think it's the MSD dist. that requires indexing.

67Dart273 said
I'm wondering if you have created a "rotor phasing" problem.

Some electronics are designed to trigger on the leading edge of the trigger, some on the negative side. I have not checked into the Mallory/ MSD combo. Maybe the MSD is triggering LATE and firing after the rotor has passed the contacts.

You can't mess up the rotor phasing on the Unilite because it's firing design is slots in the rotor curtain that passes by an optical eye so it always fires when the rotor is aligned properly. It's a very simple and nearly fool proof design. Only drawback to them is the fragile module that burns out easily.