High Torque Servo With Arduino

Hello LMR!

Recently I have been playing around with the Wii nunchuck and Arduino. Specifically this code:

http://todbot.com/arduino/sketches/wii_nunchuck_servo/wii_nunchuck_servo.pde

I got it up and running and I can control the servo, which is very cool. Anyway, I am now trying to control a high torque analog servo. I plugged in the high torque servo and just got a slight twitch. I believe this is just because of the low power provided by the Arduino ( not 6v). Because of this I decided to plug in the 6v battery pack by keeping the same signal wire and replacing the negative and positive wire of the servo with the negative and positive from the battery pack. Now nothing happened when I started it up. Is it because I applied the extra power totally wrong (most likely)? What is the correct way to do this? Because it is an analog servo doesn't make a difference does it?

you need

to connect the ground of the battery pack, to the ground of the arduino.

Thanks

Thanks amando, it works perfectly now.