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Temperature Sender (GM 3000–D)
The temperature sender is located on the top right side
of the water outlet box. It has a green connector with
blue and black wires. The sender supplies a signal to the
glow control unit (Fig. 31).
CAUTION
1. Lower the coolant level in the engine and remove
the thermistor from the water pump.
Make sure engine is cool and coolant system is
depressurized before removing the thermistor.
TEMP SENDER
Figure 31
2. Put the sender in a container of oil with a thermome-
ter and slowly heat the oil (Fig. 33).
CAUTION
Handle the hot oil with extreme care to prevent
personal injury or fire.
3.
Check resistance between pin 1 and the sender casing
(Fig. 33).
PIN 2 (BLUE WIRE)
(BLACK WIRE)
Check resistance of the sender with a multimeter.
A. The resistance should be from 1088.8 to 1225.4
TO GLOW CONTROL UNIT
TO GROUND
OHMS at 104_F (40_C).
Figure 32
B. As the temperature increases,the resistance
should be from 166.2 to 185.2 OHMS at 212_F
(100_C).
Figure 33
Electrical System
Page 6 – 20
Rev. A
Groundsmaster 3000/3000–D