Electrical load problem

I had a problem with the 73 sort of like this. Things just got dim, car didn't die. The components checked out fine. As much as I detested doing it, a weekend spent cleaning out the bulkhead connectors with contact cleaner from an old school electronics shop (used 2 cans) turned out to be the best investment I could have made.

Like 67GTX, I added up the electrical loads and found I can't run a 1000 watt power amp because it draws too much power. The 46 watt alternator can't handle it.