9XL & Mamba Max Shut down!

ok ive locktight my grub screw already and im leaving it over night to dry up. Now by tom. ill be getting a ubec from our local hobby shop. does the ubec brand matter? i've put a fan on top of the mm just to cool it down but my problem is that when i connected the plug to my reciever's batt it didnt want to work? i've tried connecting it staight to the battery and it works. do u think its my reciever that's the problem throttle and steering seems to be ok. Also, ive requested from brianG a diagram on how to connect the ubec in the system. Is there another way on getting the fan going? Thanks for the support! hopefully my mt will be up and running with no problems for the nationals this weekend. Thanks again!!!