Need help asap, msd ignition experts

[95slowmaro]

so ive recently gone carbed and using a conventional distributor. i have all msd stuff. im using the msd 6al, pro billet distributer, and msd 8680 retard box. i wired it to the exact instruction (show on top of page 4 if you click on the instructions PDF file) http://www.msdignition.com/Products/...g_Control.aspx. whats happening is that when i turn my key to the on position, im getting a fat pretty spark, but when i crank it i dont get a spark. its not supposed to spark when i turn the key to the on position. has anyone ever delt with this type of problem?

[Sahara54]

It's sparking but the engine isnt turning? Could have the 12v constant wired to a 12V key on source, that would shut down power during cranking. Or you have power going to the crank trigger wire?