Original post by: OpenROV (Sofar) ,
Hello, PWM channel 3 (Wire 20 and 21) is pre-wired to operate on the battery voltage. https://drive.google.com/file/d/0B3CACRX1pOquQmVkdG9jM0wyRHM/view You can also look through the directions for our external lights to see how they are hooked up. [guide|139] Hope this helps! -Brian G.