Rev. E
Groundsmaster 3500--DPage 5 -- 10Electrical System (Rev. D)
Glow Relay
The glow relay is attached to the radiator assembly.
When energized, the glow relay allows electrical current
to the engine glow plugs.
Two styles of glow relays have been used on the
Groundsmaster 3500--D. On machines with serial num-
bers below 240000000, two of the four relay connec-
tions are secured with screws (Fig. 7). On machines with
serial numbers above 240000000, the glow relay is at-
tached to the wire harness with a four wire connector
(Fig. 8).
1. Verify coil resistance between terminals 86 and 85
with a multimeter (ohms setting).
A. On machines with serial numbers below
240000000, resistance should be from 41 to 51
ohms.
B. On machines with serial numbers above
240000000, 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 terminals.
Figure 7
86 87
85 30
30
87
85 86
Figure 8
86 87
85 30
85 86
87
30
Interlock, Neutral, Seat, and High Temperature Shutdown Relays
These relays are located in the control panel on ma-
chines with Serial Numbers below 240000000.
1. Verify coil resistance between terminals 86 and 85
with a multimeter (ohms setting). Resistance should be
from 80 to 90 ohms. There should be continuity between
terminals 87A and 30.
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 from terminal 85 and multimeter
lead from terminal 87.
4. Connect multimeter (ohms setting) leads to relay ter-
minals 30 and 87A. Apply +12 VDC to terminal 85. The
relay should make and break continuity between termi-
nals 30 and 87A as +12 VDC is applied and removed
from terminal 85.
5. Disconnect voltage and multimeter leads from the
relay terminals.
Figure 9
86
85
87A 87
30
86
87A
30
87
85
TOP VIEW
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