I want to add a temp gauge to my Yanmar 12YSM. Curently has a 12v wire from sender to a warning light & alarm, so a 12v gauge should work off of this sender, correct? Thanks
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temp
That wire is coming from a switch, not a sender. The switch stays open as long as there is no problem, but when the temp rises above a preset number, the switch closes and sound the alarm. You'll need an actual sender, which is just a variable resistor. You'll need the gauge and sender from the same maker, it doesn't matter which, but you may need an adapter to screw into the block. In some cases, you'll need to make your own by soldering/brazing/screwing some threaded parts together.
That wire is coming from a switch, not a sender. The switch stays open as long as there is no problem, but when the temp rises above a preset number, the switch closes and sound the alarm. You'll need an actual sender, which is just a variable resistor. You'll need the gauge and sender from the same maker, it doesn't matter which, but you may need an adapter to screw into the block. In some cases, you'll need to make your own by soldering/brazing/screwing some threaded parts together.
Switch
Where does the switch go in the YSM-12. I have a YSE-12 which does not have a temp switch, and wondering where it should fit. I use a water pressure guage on the water pump hose to make sure water is flowing.
Where does the switch go in the YSM-12. I have a YSE-12 which does not have a temp switch, and wondering where it should fit. I use a water pressure guage on the water pump hose to make sure water is flowing.
YSM-12 and all others
The switch or sending unit typically go in the thermostat housing so they sense the hottest water. Alternately you can put it near the thermostat housing as long as it contacts the water in the engine block.
The switch or sending unit typically go in the thermostat housing so they sense the hottest water. Alternately you can put it near the thermostat housing as long as it contacts the water in the engine block.
Patman
You can find temperature sending units at any auto parts store. While there may be differences most are identical electrically. I've never seen one that was different but then I didn't do much work on Lamborghinis either. A temperature gage is just an ohm meter calibrated to read the changing resistance in the sender as temperature. So you need power and a ground to the gage, and then just one wire to the sensor. The return ground for the sensor is through the engine ground back to the gage ground so make sure that is in order.
You can find temperature sending units at any auto parts store. While there may be differences most are identical electrically. I've never seen one that was different but then I didn't do much work on Lamborghinis either. A temperature gage is just an ohm meter calibrated to read the changing resistance in the sender as temperature. So you need power and a ground to the gage, and then just one wire to the sensor. The return ground for the sensor is through the engine ground back to the gage ground so make sure that is in order.
switch
to 02addict: The switch on mine is to the right of the thermostat housing, threaded into the block, it has 2 terminals, but one wire that goes to the warning light.
to 02addict: The switch on mine is to the right of the thermostat housing, threaded into the block, it has 2 terminals, but one wire that goes to the warning light.
Larry W is correct.
Your stock sender unit is just an on/off switch that will close a circuit when a certain temperature is exceeeded. You would need to find a matched variable resistance sender and gauge combo. There are two requirements, The sender unit threads have to fit the threaded opening into the block and the scale on the gauge has to clearly show the range of temperature in which your engine operates. A "T" adapter which accepts the new sender while also accepting the old switch would give the best results because a boat is not like a car where you constantly glance at the gauges so having that buzzer alarm working is most important. The buzzer connected to s gradual resistance sender would not work properly.
Your stock sender unit is just an on/off switch that will close a circuit when a certain temperature is exceeeded. You would need to find a matched variable resistance sender and gauge combo. There are two requirements, The sender unit threads have to fit the threaded opening into the block and the scale on the gauge has to clearly show the range of temperature in which your engine operates. A "T" adapter which accepts the new sender while also accepting the old switch would give the best results because a boat is not like a car where you constantly glance at the gauges so having that buzzer alarm working is most important. The buzzer connected to s gradual resistance sender would not work properly.
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