I Have a Toyota Camry 1988 with alternator that can't Handle Load with Ac and headlights and Radio on for 10 minutes Then it stops charging the Battery to 12.2-12.4 V. After turning off everything the voltage slowly climbs back to normal normal voltage charge 13.9-14.0 V
Could The Alternator Have Bad Voltage regulator or is it the ECU Causing it ?
I doubt they had ECU controlled voltage in '88 so I say it's the alternator.
Sounds like a bad alternator. It's a 1988 so I'd start there.
The Alternator is not old, its a new Reman Ultima O'reilly alternator. I heard alot of autozone and o'reilly alternators don't last that long. I am considering get a Denso Reman , which is better quailty.
in an alternator there are generally 6 diodes internally, 3 positive and 3 negaitve plus the voltage regulator. if 1 diode fails thats enough for the charge system to have a downward spiral of not charging. for voltage regulators i am sure if that fails you would have a charge light on. when the diodes fail in older cars the charge light would have a dim illumination and under load would be brighter as the charge failed. also the brushes at the end of the armature can wear out causing a poor charge.
This was a new o'reilly reman alternator replacement under warranty.
