Water Leak '96 ZX180 questions

[geno368]

I have a ZX180 that has a pretty bad water leak. The other day, I had a couple of guys with me and we crappir fished for about 3 hours. When I decided to quit and go back to my boathouse, it wouldn't even plane off. There was so much water in the boat it was nearly over the batteries. I know I probably have a hose split or an aerator pump busted but don't know how to find the problem. I don't know which hole is plumbed to what device.
I have 2 inputs with screens on them( livewell inout?)
I have 2 outputs for livewell overflow I think
I have a main drain plug and right above that, there is another hole that is not plugged. What is it for? You can blow air into it freely, but a screwdriver will not go into it but 2 inches.

[Texas Larry]

First, I would fill the livewells with a hose in the driveway and see if you can find where the water is coming from. If that doesn't work, back the trailer in the water and keep looking till you find it. There are only so many hoses and connections that can be leaking, and you should be able to find it.

[wildkat7]

could be a bad drain plug. you can test at home. just put the plug in and start filling the bilge with water. If water comes out from the drain plug, there's your leak (or one of them).

[geno368]

Thanks for the replies...I have this boat in a boathouse and what I have done is use a plug to plug up each hole, one at a time and drop the boat in the water for 2 hours..I finally plugged one that stopped the water from coming in..now I have to figure out what it does, but I don't have a plumbing diagram.