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Although unlikely, if you don't have a battery switch on the boat, it is a common practice to use one of the switches on the helm panel as the main power switch for the accessory bus ( pretty much everything except automatic bilge pumps and maybe a stereo memory circuit

if you can get to the back of the switch, you would use a test lamp with the wire connected to a good ground and the pointed end touched to the output of the switch. When the switch is on, touching the output should light up the test lamp. Turning off the switch should turn off the test lamp...

Something is not right here. If the correct switch is off and we assume the switch works, the pump can't run, water or no water. Again I ask; What fuse did you pull that made the pumps stop running? Also, are you sure you are hearing fresh water pumps running and not bilge pumps?

Really? I don't see mileage as a big factor. There ere at least tom , other factors that are way more important in judging the need for maintenance. I could be wrong:)

Who really knows the mileage on a boat trailer? :) More important features would be make and model, GVWR, type of brakes ( ss discs, drums), type of suspension ( spring torsion etc) and tire age, not condition. How often the trailer is used helps, trailer that sit without use cab age faster.

The speed to stay on plane is a function of the thrust as compared to the drag. The hull speed that relates to that thrust is a different variable. So all else being equal a four bladed prop would create more thrust at lower speed and the minimum speed to stay on plane would be lower For the...

Too many variables to give a simple answer. In addition, do you want to know the speed stay on plane or the time to get on plane?

Even if the hole spacing is the same, the difference in engine weight may make it necessary to use different mounting heights. Measuring your existing hole spacing shouldn't be too difficult. If you have access to the Yami, measure that also and compare. I suppose that asking a repower shop...

When you connected you say the pump 'continued' to run. When the switch was disconnected, did the pump stop running? If so, I would suspect the switch is stuck ON. As hookup mentioned, there are several reasons why the pump wouldn't work. Follow up on his points

What and where was the fuse you pulled? The pump should be powered by a feed at the helm switch panel The switch should say Fresh Water. That switch may or may not have a circuit breaker. When the switch is o, the pump will pump if the water pressure on its output is less than the required...

If the connector you are referring to is the one that plugs into the back of the radio, i is not a Grady part. A new radio will come with a new harness that you will have to splice your wires onto. There are many posts for dash and switch replacement. Use the search feature on this forum.

Your boat most likely has a combo fill/vent filler fitting. Even though the cap is screwed down tight, there is a valve that opens and lets air into the tank when gas is consumed. Note that the non combo fillers have caps that look the same for the most part so if replacing make sure you get the...

That is true but some fuel fill lines have a grate that is supposed to deter gas siphoning. In that case the small seal from an additive bottle can get caught by the grid and partially block the flow. That can increase the back pressure and trip the gas nozzle shutoff. That said, based on the...

First If you vent is clogged, the nozzle will shut off. What type of vent do you have; external clamshell type or combo fill/vent fitting? If external it is common for insects to make a nest in the vent clam shell or if there is a screen in the vent fitting, it may be clogged. If you use...

https://gaugesaver.com/ lots of positive feedback

What is the boat model again? There is no Grady Haterus. Is it a Hatteras? What year? There is another thread on a 204 Hatteras restoration and that is a cabin boat https://www.greatgrady.com/threads/1978-hatteras-204-c-restoration.35296/

Good luck with the restoration. The first step to trouble shoot a fuel gauge not working is to locate the sender unit which is typically at the aft end of the fuel tank. There should be a way to access that spot. Usually there is a deck ( or pie) plate over that area. There should be two...

After rou display the battery voltages, turn on the ignition (do not start the motors). See what the voltages are. If nothing changes, turn off the ignition and use something that used decent power like trim tabs. Use them a few cycles and then look at the battery voltages. With an active...

Does your cover go over the caps? I will assume the caps are chromed. I can't tell if the chrome is oxidized or if it was worn off. Perhaps there was some sort of reaction between the chrome and the boat cove ( if they were covered) Try some polish like Flitz to see if the finish will clean up

If it smells right after you gas up but the smell goes away after a while, most likely you have leaky or old porous fill and possible vent hoses If you see gas sheen in the bilge water, you may have a 'real' leak that needs to be investigated.