A friend of mine, whose car I work on occaisionally uses an MSD box. Recently one of the battery leads was disconnected while the engine was running in an attempt to shut down the engine. Reason for this was that there was no coolant in the engine and he did not realise it at first.
When the engine was filled with coolant, and everything was connected again, the car would not start.
MSD 6a was replaced with a new one and now the car starts just fine.
Also, the car is running on Megasquirt, with megasquirt triggering the MSD and the MSD firing the coil.
Now we want to figure out what happened to the crapped out MSD6A.
Can MSD boxes only be disconnected first from the "small" red wire, and then from the heavy red or black wires? I wish to understand why this failure occured. is this something typical of capacitive discharge ignition systems, or specific to MSD's?