A 7.2V servo must be connected to the speed control to porvide 7.2V. This is done via the spare power lead that comes from the speed control.

What do you connect the servo to if the speed control does not have a spare power lead?

Just run the lead to the +ve of your battery pack.
Servo's FET/motor needs a direct 7.2V feed for full performance.

(assuming its a battery car, of course. If nitro...)

WC is correct, just solder the servo fet lead to the positive wire on the speedie, if the speedie has removable wires, such as a cyclone, i normally solder direct ot these posts.

Just make sure you have installed the correct fet 'choke' to prevent power spikes, otherwise you could blow the fets in the servo.

Thanks for the advice guys, I wouldn't want to blow it up. By the way, I thought I had an old Futaba S3003 in the car but when I pulled it out, it was a JR NES-510. Do you know anything about this servo. I didn't even know I had it.

Same thing ("stock" servo"), just different brand. Sounds like the bog lumps that comes with a basic JR radioset. Comparatively I think the S3003 is just a teensy bit bigger (1mm?) and maybe even a tad torquier (1oz?) too.

Hay Mr T , wll i was reding your answers thay are really helpfull ther i thought id let you know that im back to work on tuesday from 8am for four hours only for a couple off weeks ok so let me know whot you wont to do and ill catch up to you later ok. MEANTIME i HOPE YOU AND YOUR FAMILY HAD A REALLY GOOD EASTER FROM ALL OFF US................................