There is usually a 30 amp fuse in the truck's fuse box that is in the circuit that charges the trailer batteries. You may need to consult the truck's owner manual to locate it.
I had the same problem on my previous trailer. It turned out to be the hose from the tank to the regulator. There is a safety feature in the hose end (a ball/spring mechanism) that shuts off the flow if too much flow is sensed in the system, such as when there is a leak. Try putting the pigtail...
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