I have a MFD, stereo, 2 lights all to one termination block. Out of nowhere they all quit on me today. Everything else on boat works fine. If I jump the individual components over to my cranking battery, it will work. Now if I try to jump them over to either of my two trolling motor batteries, nothing; but my trolling motor still fired up. I put a volt meter to each of the terminations, and got zero reading. Can anyone point me in the right direction?