So heres my problem my mamba max esc is supposed to send 5volts to my reciever so that i can get a signal I checked the voltage on the red wire coming from my esc with my 6 cell pluged in and im only getting 1 volt the only way it works is if i use a external (4 double aa pack) and plug it into the reciever what is the problem its going on a traxxas stampede