Forum Discussion

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 ...
otrfun's avatar
otrfun
Explorer II
Feb 15, 2021
ScottG wrote:
wolfe10 wrote:
Yes, the intake heater grid can stay on after engine starting in very cold weather.

NORMAL.

If this continues for more than a few minutes after starting-- not normal.
Yes, in most cases but if it is extremely cold out, the grids will start cycling again if the truck is stopped and idling - even if it has been running hard for hours and is at full operating temps. It may also go to a high idle under those conditions.
Thanks, wolfe10 and ScottG. Good to know.

About Technical Issues

Having RV issues? Connect with others who have been in your shoes.24,201 PostsLatest Activity: Feb 19, 2025