Today I load test the alternator by an instruction in an aftermarket repair
manual. The instructions says to turn on headlights, defoggers, fan, radios,
cigarrete lighter, etc and measure the voltages. It reads 13.6V at 2000 rpm
or 11.2V at 750 rpm. It's within normal range according to the book. But the
headlight seems a bit weak unless rpm is above 1300 rpm or sometimes it just
too weak for the starter. We hardly drive in the highway. It has an alarm
system. Is the alternator fine?
TIA
Tibur