As to WHY it fried the RX? The fuse was protecting the circuit. Something (most likely the RX) was drawing too much power. By by-passing the fuse you removed the protection and allowed the bad RX to draw as much power as the battery could supply. That must have been over 7 amps or the fuse wouldn't have blown in the firt place. The RX had probably already failed. You finished it off and made any warranty worthless.[:@]