Yesterday while I was at A/C workshop to refill R134 gas in my Khyber (the gas was discharged during engine rebuilt) the A/C mechanic suggested to install a relay with radiator fan.
Now the functionality is as under:
When A/C is ON: Radiator fan is ON, with an increased speed (fan RPM)
When A/C is OFF: Radiator fan is automatic with normal speed.
The battery of my car is new. AGS-50 bought last month.
I conducted some tests with a digital multi-meter.
Battery voltage (overnight): 12.55 volts
Alternator voltage when car is idling with no load: 14.2 volts
Voltage with headlights only: 14.03 volts
Voltage with A/C only (blower at speed 3) : 13.93 volts
Voltage with headlights and A/C: 12.31 volts
Voltage with headlight (high beam) + A/C + radio: 12.22 volts.
All the readings are at CNG and idle.
I wanted to know that 12.22 volts is Okay under full load?
The last battery of my car lasted 4 years and seven months.