Posted by Bob on September 17, 2007 at 23:55:43 from (69.178.229.154):
In Reply to: measuring voltage posted by Farm130 on September 17, 2007 at 21:15:08:
Well, what's REALLY important is the voltage AT THE BATTERY. You want to keep it fully-charged, and not overcharge it, so voltage at the battery has to be held within a pretty close range.
That's why many newer systems with alternators often have a "voltage sense" lead that runs back to the (+) battery cable, to provide "feedback" to the regulator as to the actual voltage at the battery.
On a system with wire of adequate size, and CLEAN, BRIGHT, and TIGHT connections, the voltage measured at the output of the generator or alternator will be only a small fraction of a Volt higher than the voltage measured across the battery terminals.
So, if you meaure at both places, and see a LARGE voltage drop, it's time to clean up and repair the charging circuit.
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