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11-05-2018, 07:54 PM
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XR6T BA 2002
Join Date: Apr 2011
Posts: 682
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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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XR6T 2002 BA
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12-05-2018, 10:50 AM
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The good, bad and fugly
 
Join Date: Feb 2016
Posts: 1,890
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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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Time was on my side! |
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14-05-2018, 08:13 AM
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Moderator
 
Join Date: Jan 2014
Location: Melbourne
Posts: 7,940
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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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15-05-2018, 08:29 PM
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#6 | ||
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Regular Member
Join Date: Feb 2010
Location: Melb
Posts: 167
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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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