In a sidebar conversation, Warren came up with a really simple way to add the raw water alarm to our boats. The sensor that straps to the exhaust hose can be wired into the existing circuit for the engine overtemp alarm. This way, if either the engine overheats, or the exhaust hose gets too hot from lack of raw water, the alarm will sound. The sensor alone is just $54.
The steps would be:
1. Strap the sensor to the exhaust hose just below the water injection elbow.
2. route both wires to the terminal strip in the engine compartment.
3. connect the black wire from the sensor to the same terminal with the black ground wire.
4. connect the purple wire to the same terminal as the engine overtemp alarm. This wire could be identified by finding the sender on the engine or looking at the back of