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Old 09-30-2013, 10:18 AM   #15
mcnut
Beastly Adventurer
 
Joined: Apr 2006
Location: Bakersfield CA & Sammamish WA
Oddometer: 1,302
If I understand correctly you likely removed the part of the cable which reduces power to the USB standard of 5v (and removed the in-line fuse)which the 550 can use and instead feed it a full 12 - 14v which fried the unit.

You should have bought a GPS with the HD/waterproof power plug which also can accept a wide range of voltages unlike USB or at a minimum the hardwire cable for the 550 which has the voltage reducer in the middle of a cable with bare wires (see post #6).

I would try and check it out and once certain it's toast open the unit to see if it is fussed internally.

Bruce
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