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cold morning battery?

671 views 4 replies 4 participants last post by  Hot Stuff 
#1 ·
when i start my truck in the mornings whether its been plugged in or not the dash lights, headlihgts, and interior lights fade in and out along with voltmeter, as soon as i rev the moter it charges and brightens everything right up. is this normal or are my batteries or alternator starting to go?
 
#2 ·
It's the grid heater working. It's normal.

I thinkn it says something about it in the owners manual.
 
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