Hello smilex100pre and :welcome: aboard...
I have created a new thread for you, but generally, once a thread is 90 days old, unless you are the original poster, we request they be left alone as our archive...
On to your question...To know exactly what sensors are there we need a bit more information about the engine. Carburetored engines had just a gauge sender (variable resistor). Then the alarm system was added in the 90's and that added a temperature switch, which grounded the alarm line and allowed the buzzer to sound if the engine got too hot...
With the advent of injected engines, the alarm switching function was handed off to the ECU, and the second sensor was a digital sender for the ECU...
Hence, when you post a request for help, we ask for the following....
Engine model, year and serial number.
Based on those we may ask for more information, like if it's an early injected engine, we may ask if it's MEFI1 or MEFI3 (And we generally post a picture of the 2 units so you can see the differences), or if you're asking about an alternator, we'll ask which one (Merc used about 4 different alternators at various stages).... If it's a cooling question, include if the engine is raw or close cooled.
Have a read through the 'stickies' and get acquainted with the information available in there too...
Stickies. ->
https://forums.iboats.com/forum/eng...ion-for-diyers-an-work-safe-search-version-of
Chris..........
iboats Mod team
