I would recommend looking at the Four Winns website, click on the "Customer Service" link near the top in faint gray letters, and look for your model's owner's manual, Fast Facts, and other general info. Also, look in the on line parts manual if available for your year and model.
You mention an inverter. I doubt that was original equipment, so you may have some after market wiring additions or changes that would not be shown in a wiring diagram or manual. With any "not-new" boat the condition of the wiring is very important for both the 12 v power and the ground circuits.
You will have a bilge pump in the engine compartment. This pump should have a float switch and be wired direct to the 12 volt power (battery or live bus bar) to enable the pump to remove water even when switches are off as long as there is battery power to do so. If the boat will be kept in the water you need working automatic bilge pumps.
You may also have a forward bilge pump. This should also have a float switch and be wired to power the same as the main bilge pump. Both bilge pumps should be able to operate automatically any time there is enough water to activate their float switch. Verify that the float switches operate properly. If a float switch doesn't work, the boat could sink.
You may also have a shower sump pump for pumping water overboard when taking a shower in the head.
You indicated that you might be getting as much as a gallon of water per hour leaking into the boat. This is a serious leak, and I would recommend not leaving the boat in the water unattended.
Verify which pump is operated with each switch. When the boat is in the water open up the engine compartment and look leaks. A transom area leak may be difficult to pinpoint. Use a light and mirror or cell phone video recorder or??? to see where you can't normally go. Maybe even try your phone on a "selfie stick"? With the boat on the trailer, you might try adding water to the bilge with a hose. Just don't fill it up to where you are getting the starter wet. You might be able to see if the lower edge of the transom shield is leaking, or maybe the lower part of the Y pipe.
Likely places for leaks in the engine room are: 1. the driveshaft bellows 2. The gasket between the transom and the transom shield, ie, the outdrive bracket on the outside of the transom. 3. a corroded or missing bolt, leaking hose, shift cable hose, trim sensor wire, transducer wire, or other fitting on the transom shield. 4. a corroded exhaust system Y pipe. 5. Leaking engine cooling system hoses.
Good luck with yor search.
_________________ Surface Interval: A scuba diving term for that time between dives to relax and prepare for life's next great adventure.
Current boat: '02 FW 268 Vista Previous boat: '95 FW 190 Horizon
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