MSD Wiring w/ Trunk-Mounted Battery
My Dart has a trunk mounted battery and MSD 6a ignition. I simply ran the heavy red wire to the alternator output wire and the ground wire to the engine block. I am using a double pole kill switch that also shuts down the voltage regulator (which is also in the trunk so as to read the battery temperature), so things would be different if I had a one wire alternator. The alternator charging wire is theoretically not the cleanest voltage source, but I haven't had the MSD box show any sign of false triggering.