No power SOS long haul
- Thread starter Tree14
- Start date
CarterKraft
Well-known member
2017+ Ford Super Dutys are more complicated than a fuse/relay and charging current seems limited compared to the previous generation.
This is a great reason to have your tow vehicle listed in your signature line of your posts.
This is a great reason to have your tow vehicle listed in your signature line of your posts.
mlpeloquin
Well-known member
Check the voltage in the box behind the king pin. Disconnect your RV battery so its voltage is not being measured. Then trace it back into your RV. Somewhere it is open if it isn't charging your battery. I would not eliminate the possibility that the wire may have come loose in that junction box. Quite a few of us have replaced that junction box and added a manual switch and blinker. Just in case you are stopped on the side of the road and need to disconnect and go for parts. I put a second switch in for the marker lights.
wdk450
Well-known member
Do your trailer outside clearance and brake lights work?
If not, check the GROUND wire from the truck connector to the trailer chassis. Also check if the ground connector pin on the truck is connected to truck chassis ground.
Here is the standard 7 pin trailer connector wiring if you need it:
O'Reilly's, Autozone and Amazon also sell an adapter called a "7 way circuit tester" that you can plug into the connector on the truck, the adapter has lights on it that tells you which pins on your truck are/aren't working. That might be easier than using a test light or a multimeter to troubleshoot if it's not functioning on the truck's end. Although you can't beat a multimeter for a more in depth troubleshoot.
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