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The IT guy where I work just gave me about 20 Computer power supplies. They are all 19.5 volt and like 5 amp. Can I use these on wiper motors and other 12V stuff or is it too much juice???

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Well a wiper motor can handle the extra voltage but it's gonna spin the crap out of it so unless you have an application that needs speed I don't see a use for these as far as wiper motors. Most speed controllers are built for 12v, 19v will likely over heat them. As for other uses, unless it's a motor, you typically can't up the voltage that much unless you have a way to knock it down first.
 

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There should be 3 different volts available, the red wire with 18v, yellow with 8v and the orange with 5v.
 
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