Here it is... Had a issue with the pressure switch to the fuel pump relay since fixing that problem I have no spark... Have a 6M-2L msd with a blaster coil... Changed the ignition box and the mag pick up in the distributor. Checked the coil and it tested good... I'm out of ideas... Is there a breaker I'm missing????? Any ideas??

Lanyard disconnected?

Does it still have the merc rev limiter? Had problems with 2 of them on mine.

Not sure if it has one or not but I do have a rev limiter on the new msd I installed....

I checked that after I spent the $500 hangin parts... Lanyard is good...

Behind the tb module is there a box wired into the ignition?

I believe I bypassed all the old ignition... The msd has a red and black to the battery... Purple and green to distributor red is ignition hot and grey is tach orange to coil +

Are you still running a thunderbolt distributor? The advance in a tb ignition is all in the module. List all the components of your ignition system and we can help a bit better.

TB distributor
MSD 6M-2L ignition
MSD blaster coil
Just put a new mag in the distributor
Thx

The msd must get it's pulse signal from the output of the tb4 amp in order to maintain the timing curve. Did you connect the white msd wire to the grey coil wire? If you did and you have already changed the tb4 amp, then I would check the rev limiter under the amp. I had 3 fail on 3 engines within a month. Also check the condition of the connectors on the amp plug. The bottom one can turn green. If it is the rev limiter, cut out the harness and re connect without the limiter since you already have one in the msd.