Why does this happen on my supastox ???
 

With no lipo in my car

Spektrum receiver ,Hobbywing 1s speedo & savox 1350 servo

When i turn the steering by hand the receiver lights up

Only if i turn left

Why ?

motor in servo is acting like a generator/dynamo, and proving power to the rx, not a good idea to keep doing it as its unregulated and could potentionally pop delicate electrics, also will happen in al cars not just yours.