Got out there last night and unhooked the number 2 battery on the boat. I checked each one and they're all good. Least while they weren't under a load. I did take off the plate at the console that has all my gauges and checked the fuel gauge. yeh, it's getting fire but did have some corrosion on it. I cleaned it all off, then put some di-electric grease on all the connections and it still didn't work. I recon the gauge has just gone bad. Appears to be a easy changeout though. Just 6 wires to remember where they go LOL Question, Being a gauge, can you check it with the multimeter to see if ti's good? I know you can fuses and switches. Something about continuity whatever that is