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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 ...
ScottG's avatar
ScottG
Nomad
Feb 15, 2021
Before this thread gets run away with.. slightly higher voltage in cold is normal and the voltage sags you were seeing where the grid heaters cycling.
Your truck is fine.

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