Macerator pump, et al

Hi, have a new to me, a 2009 2400.  Have a couple of questions.  The macerator pump started and the stopped.  Tried to turn the screw.  No luck. Is there a fuse or circuit breaker on the pump? How can I make the cab radio work when the ignition is off?  With the queen electric bed, what do you use a s a mattress pad that stay in place all night? Feel free to contact me at markphanlon@bellsouth.net.  My home base is Stuart, Florida.  A sincere thanks.

Welcome to the forum Mark,

You should be able to turn the screw to free up the impellers. If they don't turn then try putting a little water into the gray water tank and opening the valve. Let it soak for a few hours, then try again. Just keep working it until it frees up. Otherwise you might have something hard like a screw in there. Then you will have to take the pump apart.

I do like your surname.