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Message: <blockquote data-quote="disturbed471985" data-source="post: 7576685" data-attributes="member: 611718"><p>All dmm's have the same general function the difference is the more $$$ ones are more accurate and usually have many more options to choose from. But for ur needs a cheap one will do just fine. The higher the voltage the better my car charges at 14.4 volts at idle with radio off but with radio on I can dip into the low 13's. If the radio is off then yes the batt and amp should both be the same voltage but once you turn the radio on the voltage will differ from the two. There is alot more to this but I dnt wanna write a book lol</p></blockquote><p></p>

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