Service manual

Groundsmaster 3280−D/3320Page 6 − 24Electrical System
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.
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
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.
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-
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.
3. Disconnect voltage and leads from the relay termi-
nals.
1. Frame 2. Glow relay
Figure 33
2
1
Figure 34
86 87
85 30
85 86
87
30