Msd Digital 6AL

44067gtdart said
I am not sure if this has anything to do with what you are experiencing, but I had a lot of problems with my MSD box at one time. Intermittent. Sometimes it would run and work flawlessly and other times it would not do anything. I thought it was grounded well. Anyway, I ended up running a ground wire from one of the mounting holes on the MSD box to the ground on the battery post. It has worked flawlessly ever since. It's been two years now with no problems at all.

MoparMike1974 said
MSD box shouldnt need to be grounded....the box itself. The large ground wire from the battery takes care of that.

^^^100% agreed, And mine is mounted in the plastic glove box.. BUT I have a costumer (65 Mustang) that was having the same problem.. called msd techline and went through everything said and they said send the box back.. He got it back and they said it was fine??.. He grounded the box and presto!???...
BUT now #4 no spark???
So the next day he had to take the car for paint.. still a mistery??? We think it's the cap giving a weak spark??..
We changed plugs around, wires around, and it would still light up the spark checker but no cylinder fire. Checked compression, valve lash??...
Actually I can hardly wait to get back to it when it comes back from paint...
Oddly enough to know I would try a ground wire to the Box...