HELP! My blower & bilge pump aren't working right

I put my boat in this year for the first time last weekend. When I went to turn on the blower, I could barely here it at all. Then the bilge pump was doing the same thing. I hooked up an amplifier for my stereo to the battery this winter, but that is the only extra thing I have hooked to it. Do you think that the amp is pulling too much power and is taking it aways from the blower and bilge? Thanks for any help.

You definitely aren't getting enough power.

Turn the amp off and see if it makes a difference.

Did you charge the battery up before using it this spring? You might want to yank it out and have it tested at a local auto parts store.