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Guys, just something to think about...

This could be much simpler than you guys may think. The screen in the bilge may have be completely clogged...:o Thus killing the batteries especially if you were getting lots of splash over the transom or sides. I have a rule 750 w/auto switch installed. I installed this this over two years ago and never bothered with it since. I had the same prob few weeks ago... Battery was stone cold dead... we had lots of rain in the NE. After getting it starting (replaced the battery) still very very weak output on the pump.

I un-snapped the pump then the screen...it was so densely clogged almost water tight....:o

The screen will not need big chunks of stuff to clog it. Small particles could do it as well.

Just a thought....