Glow Relay (Groundsmaster 3280−D)
The glow relay used on the Groundsmaster 3280−D
(diesel engine) is attached to the support bracket inside
the right side frame near the fuel/water filter (Fig. 33).
When energized, the glow relay allows electrical current
to the engine glow plugs.
2
Testing
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the meter test leads together.
The meter will display a small resistance value (usually
1
0.5
ohms or less). This resistance is due to the internal
resistance of the meter and test leads. Subtract this val-
ue from from the measured value of the component you
are testing.
Figure 33
1.
Frame
2.
Glow relay
1.
Verify coil resistance between terminals 85 and 86
with a multimeter (ohms setting). Resistance should be
approximately 72 ohms.
2.
Connect multimeter (ohms setting) leads to relay ter-
30
minals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay should make and break
continuity between terminals 30 and 87 as +12 VDC is
applied and removed from terminal 85.
85
86
87
3.
Disconnect voltage and leads from the relay termi-
nals.
86
85
87
30
Figure 34
Electrical System
Page 6 − 24
Groundsmaster 3280−D/3320
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