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Lights Dimming

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Old 03-08-2007, 12:16 AM
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FroneDaddy FroneDaddy is offline
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Default Lights Dimming

When it's cold outside and I first turn my truck on all my lights dim for a minute or so and then get bright again, and this continues for a while. When they dim I hear a clicking noise on the passenger side of the engine compartment. The stealership tells me this is normal, and the noise is a heater that heats the air going through the intake and the lights are dimming because the heater draws so many amps. Does this sound right?
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Old 03-08-2007, 12:23 AM
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Default RE: Lights Dimming

The stealership is right. I have an 06 and it does the same thing. It will keep doing it until it is warmed up
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Old 03-08-2007, 12:45 AM
cumminalong cumminalong is offline
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Default RE: Lights Dimming

Perfectly normal. It's your grid heaters cycling on and off. They draw a huge amount of current.

Nothing to worry about.
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Old 03-08-2007, 01:14 AM
RobertDunn RobertDunn is offline
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Default RE: Lights Dimming

HMMWVs (Military hummers if you don't know the acronymn) do the same thing.
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Old 03-08-2007, 01:15 AM
trbodiesel trbodiesel is offline
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Default RE: Lights Dimming

yeah lots of amps... look at that voltmeter swing too.
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Old 03-08-2007, 01:53 AM
Greg Swartz Greg Swartz is offline
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Default RE: Lights Dimming

Wow. I have the same issue (I guess we all do.) I thought it had something to do with the alternator and battery, and maybe some cycling going on.

Thanks for the heads up.
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Old 03-08-2007, 02:05 AM
Greg Swartz Greg Swartz is offline
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Default RE: Lights Dimming

Good 'ol military HMMWVs... Yep, I remember that now.
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Old 03-08-2007, 04:05 AM
handymanherb handymanherb is offline
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Default RE: Lights Dimming

Cummins is in the Hummer too!
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Old 03-08-2007, 04:50 AM
Kev_n_AZ Kev_n_AZ is offline
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Default RE: Lights Dimming

would that happen if ya had dual batteries??
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Old 03-08-2007, 04:59 AM
thib thib is offline
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Default RE: Lights Dimming

There is two batteries. The heaters just draw up lots of amps.
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Old 03-08-2007, 04:59 AM
 
 
 
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