Receiver socket not enough?
 

Hi Guys,

I'm wondering if I don't have enough receiver sockets, what can I do?

here's the setup:
spektrum SR3100 receiver - 4 sockets:

Throttle socket for ESC.
Steering socket for Servo.
AUX socket (or bind socket) for transponder.
Bind socket (or AUX) for External BEC (give servo 7.4v and less temp on ESC).

Now I really want to add a fan for motor, but not sure where to source power anymore.
I'm thinking servo wire splitter, let one of receiver socket to power two instead of only one, but:
Throttle socket - NO, ESC sends signal, don't want to touch that.
Steering socket - NOT SURE, servo also receives signal.
Transponder's socket - maybe, will a fan parallel with it cause transponder power source to get un-stable? and lose lap data?
External BEC's socket - NOT SURE, feed on external's bec power directly without receiver's control/filter, feels a bit dangerous.

Any advice?

Should be fine split off any of the sockets. Or get a fan that can handle running straight off the battery.