Water Pump and Electrical Gremlin
First, a little background. Last fall, I installed lithium batteries and solar panels, and a lithium battery isolator. A couple weeks later, my water pump failed, (leaking water) and I replaced it with an AES 3.5 gpm pump. As we were leaving Mini Hoots, my chassis batteries were dead. The result was flashing lights in my a/v cabinet and stairwell. I made it home, load tested the batteries, and they were bad. I got 4 1/2 years out of them, and figured it was just a coincidence.
Fast forward to now, and we're in Arizona at another rally. The water pump was acting up, and the lights in the a/v cabinet were flashing again. The water pump quit working, so I thought it was a charging issue while being parked. I got another charger and separately charged the chassis batteries, went through everything I could find and tightened all the battery connections I could find, and all of a sudden the pump worked better than it ever had! We had flow in the shower like we have at home, and life was good! Then we moved to another spot, and it was back like it was.
It seems like the water pump is getting power from the chassis batteries, which makes no sense at all. The fuse is in the bathroom in a fuse panel powered by the house batteries. When the gremlins occur, I can press the battery boost switch on the dash, and everything works as it should. The flashing lights quit, and the water pump works, until the boost disconnects. I even purchased a cheap water pump here to have as a spare, and turning it on causes the same problems as the other pump, so the pump isn't the issue. I replaced the controller, problem still exists.
It's difficult to trace out the wires from the controller to determine where power and ground is sourced because they are behind the bay panel. It seems like a bad ground, but that wouldn't explain why it seems the power comes from the chassis batteries.
Any ideas are appreciated!
2017 DSDP 4054 Spartan Chassis