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I have this wiper motor that I would like to use for a coffin prop but I can't figure out which wire is for what. I went to Scary Terry's site but I am new to this stuff and I still couldn't figure it out...anywho...could someone help. I am using a computer power supply and I have included pix of both the motor and power supply....any help woul dbe greatly appreciated.
 

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You may need to modify your power supply some to get it to work (adding resistor/automotive light etc), but black is usually ground, yellow is usually 12 volts, and red is usually 5 volts on a power supply. You could try connecting the black directly to the case of the wiper motor and then connect the red (lower voltage) to each of the wires to determine what they do.
 
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