Here is my tests made on a DC motor from a carpet washing machine. It was connected to AC with a bridge rectifier originally so let's say it's a 115VDC motor. The description plate is a piece of paper glued on it so most letters and numbers are unreadable, but I can clearly see ''U.S. Floor System'' written. The blue LCD meter is the voltage of a 12VDC 14 Amps/H deep-cycle battery that wasnt completely discharged (fully charged it's near 13,8VDC, I dislike discharging my batteries at the maximum), the small multimeter is the voltage output of the motor and the large multimeter is the amperage (set at 10A). Don't mind the date and hour it always reset on my camera when I change the batteries... I must apologize; you can hear my mom laughing on the floor above but you barely hear the brushes nor the bearings.

UPDATE: forgot to do the 12Volt testlight test, you can see it at http://www.dailymotion.com/video/xc1fun_motor-used-as-a-wind-generator-12v_tech