ELECTRICAL
10.33
COOLANT TEMPERATURE SENSOR TEST (HOT LIGHT)
With the ignition switch (and engine stop switch) “ON”, power is delivered to the hot light via the Red/White wire.
TheBlue/Whitewire(ground)outofthelightsocketisconnectedtothecoolanttemperaturesensoronthecylinder
head. In normaloperating conditions,the temperaturesensor isnon-conductive (open). If engine coolant reach-
es the specified temperature, the sensor becomes conductive completing the ground path for the light.
With engine cold, disconnect lead and measure resistance of sensor between connector terminal and ground.
There should be no continuity or very high resistance (megohms). To test the “ON” temperature, heat the switch
in a water bath to the temperature shown in table below . The switch should become conductive (low resistance)
at indicated temperature. Do not immerse switch past the threads or allow switch to contact container when heat-
ing.
Hot Light On
221° F (105° C)
HOT LIGHT CIRCUIT TEST
Disconnecttemperaturesensorwireleadandshortittogroundonthecylinderhead. T urnkeyandauxiliaryswitch
to“ON” position. Thehotlampshould comeon. Check thebulband relatedwiring ifthe lampdoesnotilluminate.
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