Question about Dodge W150

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I have a 1990 dodge w150 4x4. put new alt & battery in it. still not charging wright. pull positive cable and motor dies. already went through 4 alt. could it be the black box that connects at the alt.

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You need to check your electrical system with a digital volt meter-when the vehicle sits overnight, the battery should read about 12.5 volts before startup. You should get the same (or very close) reading at the large post on the rear of the alternator, then start it up. Readings should go to close to 15 volts, and gradually drop down to close to 14 volts at idle, again at the battery and the rear of the alternator. If it is much less than 14 (like 13) or more than 15 (like 16) you have a problem either with the voltage regulator or the ecm.

Posted on Mar 22, 2011


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