Question about 2005 Dodge Ram 2500 Truck

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Alternator has been replaced. A diagnostic tests has been done with no problems. But the alternator isn't charging the battery and not giving off 14- 15 volts and battery starts dying when turning on the lights and air.

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These newer vehicles are sensed and controled by the ECU ,so they have an extra wire ,Now normally you start engine and take the neg battery terminal off and engine should keep running but these are different ,so fit an older alternator without the ECU controlled output where the alternator is battery sensed ,i have had this yet as most of my customers have older vehicles but is shouldnt be difficult to open the alternator and connect this sensing wire to somewhere else but as i said i havent had one yet to have a play with as i would soon find some way to make it charge but i havent seen where this wire runs too inside the alternator to work out how to by-pass it

Posted on Dec 29, 2010

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It's also important to test/verify that you have a good fully charged battery (with no dead cells) before any tests of the charging system. An alternator needs ample battery power into it before it can produce good charging voltage and amps out of it and back into the battery.

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