Re: Charging issue on 69
As Dave states, 15.6 volts is too high. But, where and with what are you using to measure? Using a digital multimeter? Don't use an aftermarket add-on voltmeter.
Charging voltage is measured across the battery posts after running the engine at 1500-2000 rpm for 10-15 minutes - allows the battery to get recharged and temperatures to stabilize, both for the battery and the VR.
With no accessories on, just ignition, the max voltage should be 14.6 volts with maybe initial start up spikes of 14.8 volts.
With lights on, blower on high speed, and wipers on, min voltage might be around 13.2 volts. As a FYI, lower engine rpm and voltage will drop, then battery starts to give current to keep accessories running. Speed up rpm, alternator develops enough current to 'handle' the load including recharging the battery.
So regulator may be set incorrectly if it is a mechanical reg. Plugging in a VR715 will help cure it. The mechanical reg can be adjusted, but one needs to know the temperature of battery electrolyte and regulator, and a known load, usually a 1/4 ohm 250 watt rheostat, to set the reg. Its easier just to replace with an electronic reg.
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