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2004 Dodge Ram 1500 Question: alternator, amps and volts

 

Question

bparker, 4.7L V8, Logan, AL, February 07, 2009, 16:24
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How many amps and volts should the alternator be putting out on this truck?

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  • Answer #1

    Bret Bodas from RepairPal Test Shop, February 07, 2009, 17:37
     Master

    Most times the amperage rating is on the alternator, it will vary based on the engine/trim package, but somewhere around 120-140 amps for your vehicle should be good. Voltage should be about 13-15 volts at idle. Here is a good article on charging systems: http://bit.ly/LEf0

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    bparker, February 09, 2009, 06:03
     Rookie

    Thanks Bret, It's my sons truck and he's about 350 miles away so I can't get a meter on it myself. Anything other than a malfunctioning tester (autozone) make it test 1.8 to 2.3amps and 14.4 volts ? I did find a service bullitin on this truck for a short in the alternator wiring harness. (rubbing on valve cover?) Oh and autozone sold him a battery and an alternator but it still tested the same.

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    Bret Bodas, February 09, 2009, 09:27
     Master

    Good catch on the service bulletin, that is the sort of thing that could cause this problem. The reading you give for the amps doesn't seem right. When checking amperage output from an alternator, it will be much higher than those readings, especially with a voltage of 14 volts. He may consider finding a different place to take it to since this problem is more complicated than a battery/alternator.

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    bparker, February 11, 2009, 04:56
     Rookie

    Thanks again Bret.

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