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The correct setting of the charge voltage is critical and ranges from 2.30 to 2.45V per cell. Setting the voltage threshold is a compromise, and battery experts refer to this as “dancing on the head of a needle.” On one hand, the battery wants to be fully charged to get maximum...

1. Measure voltage between alternator frame and battery's negative terminal. More than about 1/10 volt says there's a "grounding" issue. 2. Some alternators are "single wire"(not counting the frame ground) and produce around 14.5 volts at their output terminal , assuming there's not much voltage drop between there and the battery.

Car Battery Voltage >> How to Test Your Car Battery

Car Battery Voltage >> How to Test Your Car Battery

Car Battery Voltage >> Raspberry Pi INA219 Tutorial | Rototron

Car Battery Voltage >> Raspberry Pi INA219 Tutorial | Rototron