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The [batteries](/topics-battery-dodge/) were over chargin...


The [batteries](/topics-battery-dodge/) were over charging! Replaced the batteries and the [alternator](/topics-alternator-dodge/), cleaned the terminals and now no charge! Mechanic's Assistant: Have you tested the battery...

The [batteries](/topics-battery-dodge/) were over charging! Replaced the batteries and the [alternator](/topics-alternator-dodge/), cleaned the terminals and now no charge! Mechanic's Assistant: Have you tested the battery with a voltmeter? And can you see if it's leaking or not? New batteries fully charged Mechanic's Assistant: What is the make/model/year of your car? 2008 Dodge Ram 3500 6.7 Cummins Mechanic's Assistant: Are you fixing your Ram 3500 yourself? What have you tried so far? Replaced the batteries and alternator

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Automotive Expert
Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP. Thank you for your reply and that information as this does help me better understand the situation. I’m sorry to hear you are having this problem. I know this can be frustrating. Please give me one moment to type out some info for you. I’ll be right back! A live optional phone call will be automatically offered by JustAnswer, you can accept or if you decide to decline we can continue with text until you feel the live call would be better suited to you. I will try to help you on this here
Automotive Expert
Please click on the link to view the pdf flle and the charging circuit of your 08 ram 3500 I have highlighted Please notice the connection of the alternator and the PCM ,2 wires from alternator to PCM , A Brown/grey wire & a Blk or Red wire , The charging & regulator of the alternator is built n the PCM, this a PCM controlled circuit no voltage regulator in the alternator,if you overcharging, not charging or under charging and batt, alternator and wiring checks out between alt & PCM ,that leaves PCM defective & causing this issue let me know if you can view the pdf file & wiring circuit What is the mileage on it ? **Please Let Me Know** **Thank You** **Chad Farhat** **ASE Certified Technician**

Prior to replacing the alternator the left battery cooked! After replacing the battery there was no charging!
Automotive Expert
Ok thank you for info Check the wiring between alternator and PCM, if the continuity test passes,u move to PCM connectors pins, look for evidence of melting or burn inside the PCM connectors,if good, then replace PCM The circuit i sent you and capable tech with a voltmeter can confirm issues for you and these PCM needs to be programmed to the vehicle if replaced using ford scanner or equivalent or you send them out for a rebuild if no scanner available to you and you get ot back preprogrammed,no scanner needed then

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