Dmaacleo - Yes it is working. The light on the battery box comes on when I plug the trailer in and the truck is running. Thanks.is the 12v constant on the tow vehicle actually hooked up and working?
easy to blow a fuse (eg the 2011 silverado 2500hd uses a 40A j case fuse) and if so battery won't charge.running dump trailer with bad battery can pop this fuse a lot....ask me how I know LOL
hard to say w/o knowing vehicle/pin specifics.