My current set up is 7ml-2 ignition box, hvc-2 coil, start retard box, and billet pro dizzy(locked out). I lost spark and thought it was the box had it tested by MSD and it checked out. I guess you need a special tester because they say a multi meter won't tell you if the box is working properly ?? Doesn't make sense to me but..... So, I tested the coil, then I put in a new pickup. Everything tested out ok, but boat will not start ? I pulled the coil wire, set near ground, cranked it over and I get "single spark" then its dead. So, I put a different coil in the boat and it did the same thing. I can crank it over for 5-6 seconds and I get nothing, just initial spark ????? I have heard of no spark, but " one spark " then nothing ?? Could this be the key switch going bad ? I do have the acc. on the key switch powering quite a few things but the boat has worked like this all season long.Thanks for any help.