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i'm pretty sure the two types of power connectors are 5v and 12v, but i don't know which is which. why don't you plunk down $10 on a voltmeter.with this you'll be able to check the drive connectors and power going to leds. with a decent one you can use it to identify resistors and send a small current through one end of a wire and use it to identify this wire in a clump of many. don't worry about the money, i find use for mine all the time--checking random sized batteries, etc.
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