evan_s30 Posted June 12, 2016 Share Posted June 12, 2016 New battery and had alternator tested, all good. For some reason when the battery is plugged in I get 12.5 volts. But when I unplug the battery I get 15 volts from the alternator. Anyone have any idea what is causing this? Since it should be 15 when it's on. 78z with such carbs. Quote Link to comment Share on other sites More sharing options...
Chickenman Posted June 12, 2016 Share Posted June 12, 2016 First of all never run the car with the Battery disconnected. That's a good way to blow the alternator. For the rest I'll have to think about it, but is this a Stock system or have you altered anything? Quote Link to comment Share on other sites More sharing options...
StanleySlater Posted July 16, 2016 Share Posted July 16, 2016 @ Chickenman Can you please specify what actually happens if we drive a car with the battery disconnected ? Quote Link to comment Share on other sites More sharing options...
calZ Posted July 18, 2016 Share Posted July 18, 2016 http://www.troubleshooters.com/dont_disconnect_battery.htm Quote Link to comment Share on other sites More sharing options...
tommypress Posted September 29, 2016 Share Posted September 29, 2016 @ Chickenman Can you please specify what actually happens if we drive a car with the battery disconnected ? Scratching my head over this. Quote Link to comment Share on other sites More sharing options...
steve260z Posted October 6, 2016 Share Posted October 6, 2016 I'm not even sure what's being described here but what about the voltage regulator? Quote Link to comment Share on other sites More sharing options...
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