PWM fried from servo

[Mschmeh144]

Hello

Due to a recent discussion on another thread, I have decided to see what I can make with out old Tetrix kit and motors. I have mounted a robotic arm to our robot " ghettobot" which is a test bed.
I am not using the bots systems, the arm has its own independent power and controllers, and radio transmitter of the hobby rc type. A Futuba to be exact. Also, using one saber tooth 2*12 motor controller. I ran into a problem, the Tetrix motor runs fine.the arm is a multi jointed arm so the joints all use high tec servos. I cut the end off a PWM and ran it into the screw terminal on the saber tooth, as soon as I powered the system on, the Tetrix came to life " evident by the sudden jerk of the arm" but the PWM cables I used to connect a female PWM to female fried and blew up in smoke. I was told the servos are 5-12v servos, so I see no reason for it to fry like that. I was using a 12v source with a breaker. Please help me, I know I'm probably doing something wrong