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Message: <blockquote data-quote="ttocs" data-source="post: 1492341" data-attributes="member: 11896">by "draw" I assume you mean what the fan is consuming/drawing.  To test current with a traditional meter you need to disconnect one of the power wires to the fan and then insert the amp meter between the disconnected wires.  They do make clamp/induction meters that can read current by putting a ring around the power wires but for DC they can get a bit pricey.  My idea of powering the fan from a different power source was the easiest way I could think to do it.I am not so concerned with what the fans have been drawing assuming the 2nd was good(which could be wrong).  I am more concerned with how much current the alt can supply.  Current and voltage are two different things and I just wonder if it puts out 12v, but not enough current to drive the fan.</blockquote>