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2008 dodge ram 4x4 1500. At idle wipers slow, headlights dim and heater slows when fan is on high. Is this normal?

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It shouldn't be. This would suggest that for some reason your alternator isn't performing at low speeds, especially if the problem goes away when you rev the engine up a little. I would check the connections at the alternator and battery to make sure they are tight and clean first. If you have to remove the battery cables to clean them be sure you know how to recode you radio first. That info should be in your owner's manual.
It could also be that there is not enough tension on your belt, or it could be the alternator itself. If the belt tension and alternator are both good, it should be putting out 14 Volts or a little better when the truck is idling.
You may also need to check the fan and the fan switch if everything else is good. They may be the source of the extra draw. Hope this helps.

Posted on Sep 28, 2010

  • mbnorton Sep 28, 2010

    It is covered by warranty and the dealer is saying nothing is wrong. I have called the tech reps.

  • cy schousboe Sep 28, 2010

    In the days before serpentine belts, your symptoms were a sure sign of a loose alternator belt, unless the battery cables were corroded. If tightening the belt didn't help then you had diodes burnt out in the alternator.
    If the techs are no help any decent battery and electric shop can do a "load test" on your system to find the cause and give you ammunition to fight warranty problems. The test should be inexpensive. Hope this helps.


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