I have a Yanmar
GM30F..with NO WIRING
..its secondhand, delivered from the dealer without any wiring
There are 4 senders/switches that I can see.
Top front of engine
. There are no senders in the raw water
but there are 2 (repeat TWO) senders in the coolant
. One going into and the other comming out of the heat exchanger
Question1. why 2 sensors? I guess that the one out of the heatexchanger (the hotter one) is the most important so I will use that
There is an oil
pressure sensor down near the oil filter
There is a switch at the back near the gearbox
Question 2: What the hell is this switch for???? it is a switch isn't it?? 2 spade terminals?
Help with these two unkowns would read with gratitude