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Okay I just fried my dmm last night trying this.  Let me make sure if I'm understanding you correctly.  Last night I left both terminals connected at the battery.  YOu're saying I should just leave the positive cable connected on the battery, hook my positive on the tester at the positive battery terminal and then disconnect the negative battery cable and connect my negative battery tester to the negative terminal on the battery?  Let me know if this is right or wrong,  I don't want to fry another one.