<VV> thermister (was why do manuals..)

[NicolCS at aol.com]

Measure the resistance of the thermister to ground with the lead  
disconnected.  At room temperature, you should see around 5000 ohms, give  or take a 
couple of thousand ohms.  If the resistance is radically  different (say zero, 
20,000, or 200 ohms) the thermister is bad, shorted, or has  a bad connection to 
the head.  Once you verify that the thermister is  OK,   connect the gauge 
wire to ground through a handy-dandy 100 ohm  resistor.  The gauge should real 
nearly 600 degrees.  If it doesn't  read, check the gauge ground, power supply, 
and wiring before condemning the  instrument.
C. Nicol
 
Here's Rad Davis insight page on thermistors: 
_http://www.mindspring.com/~corvair/Thermistor.html_ (http://www.mindspring.com/~corvair/Thermistor.html) 

<snip>I ran into a similar problem in tying to trouble shoot my  head 
temperature sensor (known as manifold temperature gauge in the '65  
service manual)  On page 12-10 it states, "The manifold temperature  
gauge requires very little servicing other than testing for  
malfunctioning, keeping the connections clean and tight and replacing  
defective units."  How can you tell if one is defective (my engine is  
in pieces under the car)?

Stephen  Upham<unsnip>