I have a 2021 Mallard Pathfinder 17qbh. Though I'm not making a habit of this, I had the trailer connected to an outlet in the garage and the 7 pin connected at the same time. Immediately, a charge seemed to back up into the wiring going from the 7 pin to the battery of my truck, melting the 12 gauge wiring and smoking. Has anyone encountered anything like this before on their trailer? Searching on whether one can have both of these plugged in at the same time I see varying responses. Even if you are not supposed to do it, it shouldn't almost set fire to my truck, right? Thanks for any insight!