My car is making some problems regarding it's electrical system, lights get dim after some WHILE, and csr starts to decrease it's fuel efficiency, blower works weak, and when radiator fan turn on automatically engine seems to work harder.
When car is on idle voltages are : 13.8 to 14.2
When car is on load and on 2000 rpm: 13.5 to 13.8
But i think for whatever reason alternator loose it's efficiency after it gets hot or something because it keeps undercharging my battery, sometimes when lights are on and tries to start the car it won't start.
Is it possible if car alternators bushes starts to stop working correctly after the alternator gets hot because of temperature?
When after a long drive i come home and check the voltage on load they goes under 12.6 too and for some times they drop to 12.6 to 13.4 etc, should a alternator drop voltages to 12.6 ever?