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Clayso, Master Automobile Technician
Category: Dodge
Satisfied Customers: 880
Experience:  ASE Master Certified Automobile Technician. 30 Years Experience.
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Just replaced my 2 batteries and alternator on 2005 ram

Customer Question

Just replaced my 2 batteries and alternator on 2005 ram cummins diesel but alternator gauge fluctuates still
Submitted: 1 year ago.
Category: Dodge
Expert:  Clayso replied 1 year ago.

Hi Rob, I'm Clay a certified master automobile technician with 30 years of automotive repair and diagnostic experience.

From your description most likely there is excessive voltage drop from one battery positive to the other. Check voltage drop with a voltmeter one lead on one positive and the other on the other batteries positive. Voltage drop should be less than 0.2 volts with the engine running and the alternator charging. Voltage drop should also be checked on the ground cables. If voltage drop is greater than 0.2 replace the cable(s).

I hope this information is helpful. If you have any questions or run into any problems let me know.

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