Quote Originally Posted by Carter1 View Post
I had some coming in where the transom mount bolts came through. My boat is over 20 years old. I took the bolts out and filled the holes with silicone caulk and put the bolts back in. That stopped the leak. I found the leak by looking in the transom as soon as I launched the boat while everything was still dry.
^^^ This First. Then, if you still can't find it, get it done right. You can also turn on a really bright light inside the bilge at night and look for light to leak out if you can't find it right as you get in the water.

I had a leak through the top of a tie down U bolt one time. It took the right amount of weight in the back for the leak. I found it with the light method. Pulled the U bolt, siliconed the holes and reattached the U bolt. problem solved.