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Discussion Starter #1
My brother has a 2000 2500 2wd Quad cab and here lately with it getting it cold he says when he starts the truck in the morning, its like the alternator doesn't start charging for a few seconds. The volt meter in the truck stays low and then after about 30 seconds or so, the alternator will start charging. Has anyone heard of this or is this normal or a problem? thanks.
 
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More than likely it is cold enough for the grid heater to kick on and it uses a lot of amps. It is perfectly normal for this to happen and depending on how cold it is he will ntoice the volt gauge swinging until the intake temperature reaches 58* or he reaches 20mph.
 

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Discussion Starter #3
ok i'll tell him. He also mentioned that when it does he went out and popped the hood and the fan would spin really slowly and then like all of a sudden it would kick in and start spinning? is this part of it as well?
 

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Just what Bouncer said.

Also as long as he isn't getting a Check Gauges light there isn't a problem. My Optima red tops are getting a little old and they will drop low enough when cycling the grid heaters to give you a Check Gauge light until the alternator can catch up to the voltage drop. I need to get some new batteries before it gets too cold around here this winter.

DB
 
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The fan is on a internal clutch that works off heat, so the only thing there would be the engine is just phyiscally slowing down and speeding back up. The grid heater really puts a pull on the alternator which really pulls down on the engine.
 

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Discussion Starter #6
Thanks guys, i told him. He hasn't had the truck long, so still learning a lil about bit about them.
 
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