Sorry if this is a rudimentary question but I'm not finding a whole lot of info online and I'm pretty green when it comes to gauges and sending units.
I'm trying to figure out why neither of the temp gauges work in my 'new to me' boat. The engines are mid 80's Crusader 270hp, raw water cooled. There's a temp sending unit in the tstat casting and another in the intake manifold. The one in the tstat casting seems to affect the alarm buzzer when I mess with it, so I'm guessing this is an overheat alarm? The one in the intake manifold pegs the gauge when I ground it which should mean it's associated with the temp gauge, and that the temp gauge is functioning properly, right?
Picture attached showing both sending units.
Any insight you guys can offer as to how these two sending units interact would be greatly appreciated.
I'm trying to figure out why neither of the temp gauges work in my 'new to me' boat. The engines are mid 80's Crusader 270hp, raw water cooled. There's a temp sending unit in the tstat casting and another in the intake manifold. The one in the tstat casting seems to affect the alarm buzzer when I mess with it, so I'm guessing this is an overheat alarm? The one in the intake manifold pegs the gauge when I ground it which should mean it's associated with the temp gauge, and that the temp gauge is functioning properly, right?
Picture attached showing both sending units.
Any insight you guys can offer as to how these two sending units interact would be greatly appreciated.
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