I discovered that the relay behind the glove box (Toyota #27790-35010), which when faulty can activate the dash charge and brake warning lights, was only used on '81-83 4 cylinder trucks and some car models of the same vintage.
Other problems cited in threads on illuminated brake/charge warning lights included wire pulling out of the back of 3 prong plug that inserts into back of alternator, improper insertion of that plug, loose alternator belt and broken/frayed wire where the wiring harness crosses the frame of the vehicle.
