M&H wiring harnesses

OP - you really need to get an original wiring diagram or service manual. Replicating the PO's bad decisions is a disaster waiting to happen. The tap for lighting package is indeed at the cigar lighter. The M&H dash harness is the wiring that comes with all the cars regardless of options. The lighting package was an option, whether you have AC or not determines what the heater subharness looks like, the console was an option that not all cars had.

I agree with 4spragtop that tapping the back of the alternator for top power sounds like a disaster.

By the way, what is the NSS? If it is the neutral safety switch there is a subharness that plugs into the dash harness or the bulkhead connector (depends on year, model and options). If you had a manual shift car there would not be a neutral safety switch so that subharness would be different.