I just finished repairing my HWH leveling system that hasn't worked since I bought the Big Rolling Turd. I had to put on a new tank and fix some bad wiring. The 12V for the pump led up to the engine compartment, but was disconnected when I bought it. I felt that since it was a power hog and needed fast amps when run, that hooking to the engine battery was the place to be, did I guess right? The 12V cable was long enough that it could have been hooked anywhere.