To check if the sync cable is fully functional, you'll need a multimeter. You can achieve the samething by using a flashlight bulb, the battery inside the flashlight and a piece of wires.
Multimeter:
1) switch to ohm meter
2) Test the 2nd and 3rd pin inside the usb side against the entire zune port side of the cable.
3) If you've tested 2nd and 3rd pin of the usb connector against all the pins on the zune port side of the cable, and the ohm number comes up as infinit or 0, that means your cable is broken
4) "" "", and the ohm number comes up as a 1-100 ohm, then your cable is fully functional
Lightbulb, battery, wires
1) You'll need to make a basic circuit using the wires, battery, and the lightbulb.
2) make sure the light bulb lights up
3) "" "", and the light bulb lights up on both 2nd and 3rd wire on the usb connector, then that means your sync cable is working
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