[C320-list] Temperature Gauge

[Ronniew326 at aol.com]

The engine temperature gauge on my 1996 vintage Yanmar 3GM30F seems to have 
 gone haywire.  When turning the key on the gauge needle pegs  itself all 
the way over to maximum hot even though the engine cooling system  seems to 
be working perfectly well (no blockages in the strainer, normal water  flow 
coming out of the exhaust, no apparent overheating of the  engine).  I ran 
the engine for several hours on a cruise last weekend, and  except for the 
gauge, all was normal.
 
Thinking that there might be a wire connectivity problem (corrosion)  
somewhere I spent some time the next day cleaning all the wire ends and  
terminals in the gauge with sandpaper.  Still no luck.  So I'm  thinking that either 
the gauge is broken and will need to be replaced, or  perhaps the wires at 
the engine side are either loose or corroded.   The only problem is I don't 
know where the wires on the engine side are  located.  Any suggestions would 
be greatly appreciated.
 
Ronnie Williams
s/v Banana Wind   #326