Anybody ever have wiring issue affect the firing of your ignition...I have full msd and the motor was purfect on the dyno now it is missing when in the boat.....I think i may have wired something wrong and it is effecting the box.......For some reason i have no tach output on the box either.....brand new 6aln box, i bought it last year when it started to due this and it did not change with the new box......

Is your box wired direct to battery? Not to engine hot.

YES, to the battery...is that a problem.??....the signal wire is on the key switch...

The box can't tell where the current is coming from. In marine applications, the first thing I always question is grounds and corrosion. Is there a chance you have your coil leads switched?

Remember that the distributor will fire the coil without the box. You can bypass for a test.

I dont think so, i left all the wiring intact when i went through the motor this year........It is missing like crazy, i am searching for a new harness (boat side) i must have wired something goofy.......It is the only thing i can think of.....Motor on the dyno perfect, drop in boat and caca...

is the 6aln like the 6m2 in anyways?

exactly just a different wiring diagram....

when it was on the dyno, did you use your ignition?

more to the point, why are you using an absolute piece of garbage like the msd 6 anyway ? if you persist, i suggest having 2 spares on board and one on your keychain so you can at least get halfway home...

People have their ideas of what works and what wont work...If ya have some helpfull hints of what could be my problem i would love to hear them? It is always better in life to be part of the solution and not part of the problem......I guess i know where you stand....