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Old 11-05-2018, 07:54 PM   #1
NCII40
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Default Post Your Alternator Charge Voltage

Looking for comparison and for future references for other Members



My Alternator Charge Voltage on my 5.0 NU starts at 14.10 then slowly drops down to 13.9 then fluctuates back and forth between 12.9, 13.2 back to 13.9



Using Forscan



What does your alternator do..
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Old 11-05-2018, 09:37 PM   #2
speedzter
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Default Re: Post Your Alternator Charge Voltage

How are you testing , Just idling ?
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Old 12-05-2018, 10:50 AM   #3
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Default Re: Post Your Alternator Charge Voltage

There are many factors that affect the voltage in a vehicles electrical system.

There would have to be specific testing criteria for the information/data to be valid and useful to others.

Such as but not limited to:

Year, model, Km travelled and engine type for the vehicle.
Make and model and age of the alternator.
Battery make, model and age.
Engine RPM.
Alternator RPM.
Output current and voltage from the alternator (Measured at the same testing points with meter/s that have similar accuracy)
Temperature of the alternator housing.
Probably others that I've forgotten.
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Old 14-05-2018, 01:00 AM   #4
NCII40
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Default Re: Post Your Alternator Charge Voltage

Cool...
Any other 5.0's out there that can give me a reading on theirs to compare to mine?
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Old 14-05-2018, 08:13 AM   #5
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Default Re: Post Your Alternator Charge Voltage

Alternator charging voltage also varies with temperature.

On hot summer days, you will find alternator output voltage will be lower than on cold days.

So member’s results in replies can vary depending on climate and temperatures.
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Old 15-05-2018, 08:29 PM   #6
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Default Re: Post Your Alternator Charge Voltage

Yep the regulators are designed to decrease voltage output with increasing temperature... this is done to top the battery up quickly after a cold start without overheating/overcharing the battery on longer drives. On an AU you should get about 14.5 on startup decreasing to 13-ish once fully warm. Might dip a bit lower at idle with lights, fan etc running.
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