How It Works; Testing; Water Temperature Sender; Purpose - Toro TX525 Service Manual

How It Works

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.

Testing

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).
TX525 Service Manual
2
1
Fig 0813 PICT-4176

Water Temperature Sender

Purpose

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.

Location

The water temperature sender is located below the
cooling system thermostat (Fig. 0814).
Rev. 000
ELECTRICAL
Fig 0814 PICT-5307
5-9