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I just finished up a ten day..(daylight til dark) (2000.00) rebuilding the top half of my 1974 Mercruiser 351 W / 302 Ford. Fun-Fun! Won't ever do that again...Anyway. My Thermostat gauge is not working properly. At first I had a automotive thermostat in there with an automotive sender... I happened on it in the book that I should never do that and took it out before ever starting the engine. Still waiting on the sender to arrive tomorrow. Nonetheless, I don't see why the gauge is doing this.... When everything is off, including the key... it registers 220 and beyond (maxed out), when I start the engine it goes back to 180 and then slowly (within ten seconds) on over to maxed out again. Also, oil pressure gauge is maxed... Anybody?
Sounds like the wires on the back of the gauges are on the wrong posts. You should have three posts on the back of your gauges. One is the hot lead the other is the neutral lead and the middle one is usually the sending unit. When the resistance of the sending unit changes with temperature, it reduces the resistance in the sending unit and this allows the voltage to increase across the gauge and thus the temperature goes up. If you have the wires on wrong then you would have full voltage at startup and then just after startup you would see it drop then climb again once it warms up. check to make sure your gauge is wired correctly.
Boat Name: A TAD TOO MUCH
Model: 1978 F-32 Sedan Cruiser
Engines: Twin Chry 360's 666 hrs original engines
