Car pass-through

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Vinny

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May 1, 2009
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I learned the hard way that the ground and negative in the USB connector aren't always connected together. The passthru might use either the ground or the negative wire in the cable but the adapters only use one or the other. I have a battery pack that uses 4 AAs and has a USB connector on it. I had to solder a jumper in it between ground and negative to get it to work. The USB in the computer ties them both together. Whether that's what's happening in your case, I don't know but it's worth a look.
 
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