MSD analog relibility; any ideas?????

Seems like the MSD tech is confusing your BTM ignition with one of the capacitive discharge units like a 6A or 7A. The wiring on those uses an orange wire connected to the positive of the coil (with no other wires connected toi the coil + ) and a black wire connected to the -.

If it worked as he suggested and the orange wire connected to the - of coil and the cars electrical system connected to the + as well as the power for the BTM that 100+ volt output would still burn up the cars electrical system and and BTM too.

Getting the 12 volts up to 100 volts is quite easy. Just like the coil, you put 12 voilts on the primary windings then let the field collapse and you induce a voltage on the secondaries that is equalt to the turns ratio of the coil. Remember the coil is putting out to the plug anywhere from 15,000 to 45,000 volts from the 12 electrical system.

The orange wire on your BTM has no output. It is a switched path to ground. It works just like the mopar electronic igntion or a set of points for that matter with the added ability not just trigger off the pulse from the magnetic pick-up or points opening but to adapt when it triggers to retard the timing.