12v power when plugged in
So we have a new Grand Design trlr. On this trlr, if the battery is at 75% on the panel and I plug it into our truck, the voltage doesn't change. Even after driving all day the voltage will not have ...
Forum Discussion
Our Grand Design batteries are charged when we're driving. I know you said you checked the power at the truck, but just in case you want to check it again, here's a diagram for checking it out:
Set your volt meter to DC volts and make sure you're measuring about 13.5VDC between pins 1 & 4 with the truck running. If not, track down the issue with the truck.
If you confirm the 13.5 volts at the truck, check the voltage at the battery on the FW. You'll probably be between 12.0 to 12.6VDC. Then connect the 7-way plug between the truck and the trailer. Start the truck and verify that you now have about 13.5VDC at the battery. If not, the problem likely is in the FW and you need to track it down. It could be something as simple as a blown fuse.
Set your volt meter to DC volts and make sure you're measuring about 13.5VDC between pins 1 & 4 with the truck running. If not, track down the issue with the truck.
If you confirm the 13.5 volts at the truck, check the voltage at the battery on the FW. You'll probably be between 12.0 to 12.6VDC. Then connect the 7-way plug between the truck and the trailer. Start the truck and verify that you now have about 13.5VDC at the battery. If not, the problem likely is in the FW and you need to track it down. It could be something as simple as a blown fuse.
