Basic problem was car felt heavy to drive in night with lights on. Thought to have alternator tested. Recently placed new belt and appropriate tension was given.

Car is Cold so is alternator
No Load Condition:

@ idle Battery Voltage = 14.2 V
@2k RPM Battery Voltage = 14.2 v

On- Load:
Head- Lights; Low and High Beam

@ idle Battery Voltage = 13.7 V
@2k RPM Battery Voltage = 13.7 v

With AC along with blower motor

@ idle Battery Voltage = 13.4 V
@2k RPM Battery Voltage = 13.4 v
Car and Alternator are hot

No Load Condition:

@ idle Battery Voltage = 13.7 V
@2k RPM Battery Voltage = 13.9 v

On- Load:
Head- Lights; Low and High Beam

@ idle Battery Voltage = 13.4 V
@2k RPM Battery Voltage = 13.5 v

With AC along with blower motor

@ idle Battery Voltage = 12.9 V
@2k RPM Battery Voltage = 13.4 v

From tests above i think alternator 's voltage regulator is weak i guess as it gets too hot under load. You cant touch it. As compared to power pump that is on same bracket so if it was engine transferring heat it should be almost same.

Positive and Ground connections are good.
Engine = F18B( 99 accord )

 

looks perfectly fine

 

Someone told me that on full load the battery voltage should never ever be below 13.5 -14 volts

 

My autozone rebuilt alternator is lower than that voltage fully strained and it has no issues whatsoever going on 2 years.

If you want to replace it, go ahead, just go Denso reman and you won't have to worry about anything.

 

Thanks man...........instant help as always. Stay blessed