Hi, I am currently trying to test my MG995 servo. Whenever I hook up everything I just here a faint click.... click.... click. I hooked up a small 9g towerpro servo and it worked fine, therefore it's not a programing problem. I have the yellow wire hooked to data, red to 5V, and brown to ground. I have four of these types of servos and each fail in the same way. what am I doing wrong?
You're not powering the servo directly from the Arduino are you? If so, that's a no-no. 
This is the way that I have it set up now, and it still isn't working. I guess I'm lost on how to hook up a servo/Arduino to an external power supply. (Blue = Servo Digital Pin | Green = Servo Ground | Red = Servo Power (5v) | Black = Batter Ground)
drsdrs:
This is the way that I have it set up now, and it still isn't working. I guess I'm lost on how to hook up a servo/Arduino to an external power supply. (Blue = Servo Digital Pin | Green = Servo Ground | Red = Servo Power (5v) | Black = Batter Ground)
Right, that should be fine. One thing - you say external power supply, and also say "Batter(y) ground", so I assume it's a battery.
Which battery or batteries?
And I think you should show us your code, it's looking more and more like a coding problem.
(Formatted and between code tags of course. 
)
I second OldSteve's request for more information about the power supply.
Servos can require a surprising about of current (over 1A for short periods of time). They seem to really hate wall wart power supplies.
Do you know how much current your power supply can source?