I have a 2002 260 Sundancer. The bilge has water just above the red & white pump. When I turn the pump on via the main console the light comes on but no sound and the pump does nothing. I'm going to pump out all of the water from the bilge. What I'm I checking for first. From what I've read the float switch could be clogged so, I'll pull that up first. Any other suggestions would be helpful.