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Message: <blockquote data-quote="n2audio" data-source="post: 566131" data-attributes="member: 540940">you can't read high current with a dmm.For voltage you just set it to Volts DC.  Usually there will be a 20 range which is what you want to use.  THen just touch the probes to the battery + and -.  You might try it first w/the car off then with the car idling just to see how the voltage changes.Then to learn a little more you can turn on your car's accessories 1 by 1 (lights, heater blower, stereo ) to see if the voltage comes back down.  With an alt that big it shouldn't change much.</blockquote>

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