Believe refurbished means tested and it was working so cleaned/repackaged and sold...
Agree with the voltage regulator being a likely cause. I replaced my voltage regulator on the alternator and it's not a hard thing to do.
What I did though was get one of the plug into the cigarette/power socket voltage displays from eBay to monitor the voltage to ensure it was installed and working correctly. I could monitor the voltage output in real time....
Alternatively you have a battery with an issue...
Need to measure the voltage output of the alternator to see which...battery or alternator is causing the issue...
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