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otrfun's avatar
otrfun
Explorer II
Feb 15, 2021

Cold Ambient Temps = Higher Alternator Voltage?

Our '16 Ram 3500 Cummins (220a alternator) typically charges around 14.3 - 14.4v about 95% of the time. On occasion charge voltage will drop to 13.9v on a long trip when the batteries get topped-off ...
theoldwizard1's avatar
theoldwizard1
Explorer II
Feb 15, 2021
What are you using to measure the voltage ? The gauges on you dash are not very accurate.

Constantly >14.0V is actually not "normal" ! After running for 5-10 minutes, the voltage should be <14.0V

Make sure all battery cable connection are clean and tight. Constant high charging voltage could also mean your battery is on its last legs.

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