Today I finished some upgrades and ran about 10 feet before my esc quietly died. I read about the bec failing and tried hooking up the external battery and removing the red receiver wire. It did not work. If I leave the red receiver wire in and hook it all up with an external bec battery, then the esc and motor run off the 6v receiver battery (tries to, goes super slow). Then if I attach the lipo battery things run like normal. I should add that it now makes no beeps. When the esc switch is off the esc still runs the motor but stops and flashes yellow and free after a few feet. If the power switch is on then it runs like normal except no beeps. Anyone have any insight as to what's going on? Should I leave the red wire in and hook up a on/off switch the the external receiver batt?