Battery voltage is never stable; it will bounce as the load changes. A Made in China cigarette lighter volt meter isn't a test tool and I wouldn't trust what it tells me for a second.
You need a REAL voltmeter connected to the output of the alternator (positive terminal of battery) if you want a TRUE reading. Watch this youtube video: Read the comments; people make good points...if the battery temp is higher or lower than 68 degrees, then "normal" voltage will increase/decrease accordingly. Most auto parts stores will do this test for free in hopes of selling you a battery or an new alternator. ~~~ with the car off: I would disconnect the + terminal and read the voltage. Reconnect the + terminal and read the voltage; should be the same. Start the car and measure the voltage: >If the voltage is the same, then the battery is not charging or discharging...it may be fully charged or the alternator output can't match the load...may or may not have a problem. >Voltage is higher, battery is charging - all is good. >Voltage is lower, battery is discharging - alternator bad or simply can't meet the load you're demanding (say you had some super power hungry, non stock, item on in the system..1000watt off road lights) |
Thank you all for your comments!
I finally got the alternator replaced. Now the voltage is nicely around 14.5V all the time - morning, evening, load, no load... the way it should be. |
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