No Power to Boat

I need some help...

I finally hooked my boat up this afternoon to take it out for the first time this year and went to trim my motor up but I have no power. I've got two power shut off switches and both were turned off while stored over winter. Well, when I turned both of them on, nothing happened...no beep and no lights came on. I'm not getting any power at all??? My batteries should be good and have been charged off an on over the winter. Any suggestions???

load test the batteries first no sense in working on other things that are not broke.

1. Pull all leads off terminals
2. Test battery voltage while you have all leads off to clean them.
3. If batteries are good reinstall all leads(no wing nuts) & tighten.
Either your batteries gave up OR connections are corroded or loose or both.

Ok, thanks guys. I think it's dead. My on board charger is blinking both red and green so I'm assuming that's telling me the charger isn't reading a charge??? Somebody suggested to hook it up to a manual charger...

If you have a battery switch it could be bad.

Ok, thanks for all the posts! So I borrowed a manual charger and charged the bad battery for about 3-4 hours to get enough voltage so my 4 bank on board charger would pick it up and finish the charge. It worked and all lights are green.

Who all leaves their batteries on charge all the time? I've heard different things but wanted to get some other opinions. I've got a Dual Pro Sportsman Series Quad Pro on board charger. Anybody familiar with this charger? I'm assuming it stops charging once the batteries are completely charged? Just want to make sure I'm doing what I'm supposed to maximize battery life.