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Also, some fan speed controllers are setup so that they draw the same current regardless of setting. My Jeep draws more current at higher settings than lower. You can test this by checking the battery voltage at different fan speeds while the engine is off. If it always draws the same amount of current, the voltage will be the same regardless of the fan speed. If the current draw varies with fan speed (higher speed, higher current draw) then the battery voltage will be lower at higher fan speeds. If you have the engine on while doing this the readings will be inaccurate due to the alternator charging the battery.
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