ELECTRICAL
5-9TX525 Service Manual Rev. 000
How It Works
Testing
Purpose
Location
Water Temperature Sender
The glow pug switch is manually depressed and held in
place for 10 seconds. This activates the relay that closes
the circuit which sends current to the glow plug.
The water temperature sender is a temperature-
depend ent variable resistor. As the coolant temperature
increases, the internal resistance decreases. This
causes a change in voltage applied to the water temper-
ature light, which indicates a higher temperature.
The water temperature sender is located below the
cooling system thermostat (Fig. 0814).
Only terminals 1 and 2 are used in this application. The
switch can be tested with an ohmmeter. There should be
no continuity between terminals 1 and 2 except when the
switch is depressed (Fig. 0813).
Fig 0814 PICT-5307
Fig 0813 PICT-4176
1
2
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