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Message: <blockquote data-quote="ngsm13" data-source="post: 3094867" data-attributes="member: 544830">Both Autozone and Advance Autoparts around here do it, for free.They roll out a cart to your vehicle, hook up a pair of cables... along with a clamp meter.The machine then basically tells the employee what to do... they'll have you idle, rev to ~2000rpm, and then idle again. During this time it will be putting a load on your alternator...Then it will give you output amperage, and charging voltage.At least that's what both machines did at the local ones I went to... even though it should be idiot proof... it helps if the person actually knows what they're doing.nG</blockquote>

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