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Old 06-24-2010, 09:20 AM   #8
cbillelder
Senior Member
 
Join Date: May 2010
Posts: 961
Default Re: Ammeter vs Voltmeter

I think if your voltmeter is reading 13.9 volts, it has to be charging, since batteries only put out 12 volts at best. My only other thought is that an ammeter requires all the generated current to run through the dash to get to the gauge. With an alternator, this will be at least 60 amps or more. This might increase the potential for a catastrophic short. It happened to me once years ago in my old Model A. Voltmeters are easy to fuse for protection.
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