No sound after winter storage??

Hello guys,

I need your help to figure out what's wrong with my stereo setup..

My setup is simple 2 rca output from deck to amp. One rca output is for 4 in boat speaker and the other output is for the Kmt6 on the tower.

Everything was working real good before storage...but today I was preparing the boat for the summer (the only thing unhooked for the winter were the tower speakers) and when I tried the stereo no sound at all was coming from any speaker...

My deck is working and there is power for sure on the ampli and the fuse is ok

I first thought that my problem was from the deck that resetted all setting because the batterie was disconnect but that doesn't seem to be the problem.

My batterie seemed low (it's charging right now) could it be the problem?

every cable speaker and power is connected fine like last year since the only thing that was unplugged for the winter were the tower speaker...

Does someone can help me to find the problem? Were should I start to look and how?

Thanks for your help guys.