Quote:
Originally Posted by Andrew666
Hi has anyone noticed or experienced voltage fluctuation with their car.
I’m not sure if this is part of their fuel economy approach (decreasing alternator load therefore engine load) and only charging the battery when required. But I have notice on my Scan Gauge (also checked with a multimeter) that voltage fluctuates between 12.5 to 14.3 volts when driving the car above 1500 rpm at normal running temperatures without lights or other electrical accessories on . No warning lights come on or codes are set.
Thoughts?
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Yes!! I noticed the same thing while on a 10 hr trip to Myrtle Beach. I have a radar detector that gives voltage readings. Around town with the climate control system on or off it always runs 14.2-14.5 volts.
During the trip for some reason I turned the climate control completly off while driving for several hrs at interstate speeds. The voltage dropped to 12.4-13.2. (switching quickly back and forth between those numbers). When I turned the climate system on and it went up to steady 14.2-14.4.
Seemed like with no load on the car and driving for several hrs the regulator reduced the voltage. Maybe to not over charge the battery? Maybe as way to increase MPG???
I was concered at first that maybe the alternator was bad but this happened 4 weeks ago and everything has been fine since.