Normal regulated voltage against a fully charged battery (very important!) is 14.7V, measured at the battery posts, not the terminal clamps. 10 amps or less of current flow into the battery at a fast idle is also a good indicator of full charge. Depending on where the dash meter is connected to monitor the voltage, a few tenths higher isn't a problem. To get proper regulator monitoring from the 10-SI, you'll need to be flowing 10 amps or less total current output from the alternator. A shorted 10-SI internal regulator will produce 17-18 volts at idle, and over 20 with the engine revved up.
a few tenths of voltage variation is pretty much nonsense- - - -the real indicator of proper battery charging is whether or not you're having to add water to an open cell battery frequently. Losing electrolyte level consistently is an indication of overcharging. Sealed batteries- - - -you're pretty much on your own there, other than the battery should be able to crank the engine easily, in very cold or very hot operating conditions.
Jerry
Last edited by Rusty Rod; 02/23/2023 3:19 AM.
