bk 9920 problem... help needed before returning product...

i shortened the battery wires of the controler, because the instructions say that i have to be careful about the wire length... less than 10cm between controler and batteries...
I have all the material to replace these wires, do you think that it could be the cause of this pb?

for the rx plug, it seems to be well plugged... and moving in the rx it doesn't resolve the problem...


please let me more time to try all the solutions that you provided before... i will take some days to work at this, all thanks for ur help guys! I've some axles for my researches... :018: