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Why will my Alternator not generate a charge.

(1990 Dodge D250)
in Yulee, FL on December 07, 2011
I replaced the alternator. No voltage. I grounded the (-) field terminal to the alternator chasis and the alternator then produced voltage. The alternator stated it is internally regulated. However, I was informed that my D250 has an external voltage regulator. I cannot find it. If it does have an internal and external voltage regulator it seems like this would create large problems.
I have not been able to locate any shorts, or opens yet. Fuses seem to be good. I have had conflicting information about the SMEC/PCM. I have check engine light on. codes 12, 33, 35, and 41 via flash codes. Break light, check engine, mainenance required idicators are lit. Truck runs great on battery power.
I don't want to put a bunch of money into the vehicle. Any suggestions?? Thank you
Sincerely,

Jeff Mohler
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Popular Answer
on December 12, 2011
Hello Jeff!Basicly what you saying is that your endine ground is missing.Your chassie and engine has to grounded to the negative battery terminal . On your vehicle the negative battery terminal connected to chassie and the engine ground is connected to chassie.
I would check for broken ground cable to engine.
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on December 12, 2011
Hello Jeff!Basicly what you saying is that your endine ground is missing.Your chassie and engine has to grounded to the negative battery terminal . On your vehicle the negative battery terminal connected to chassie and the engine ground is connected to chassie.
I would check for broken ground cable to engine.
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