We just bought a 1993 Hunter 28. When we filled our holding tank for the first time, the Tankwatch indicator never lit up. I investigated the circuitry, and found that there is a 580 Ohm resistor in series with the light bulb in the panel (the one in the head where the light bulb is). When I put 12 V across the light bulb, it shines brightly. When I put 12V across the resistor + light bulb, the light bulb filament barely gets warm enough to glow. I suspect that the float switch itself is working, but the resistor restricted the current so much that the bulb didn't glow visibly. Is there any particular reason that it is wired in this way? Will bad things happen if I get rid of the resistor and replace the bulb with one that I know is rated to take 12V? Or do I need to get a light bulb that will shine brightly enough even in series with the resistor (though the current will be down around 0.02 A, so I'm not sure this is even possible)? Much "tanks" for any insight you can give, Robb