Groundsmaster 3500Page 6 - 16Electrical System
Glow Relay (Diesel Engine Only)
The glow relay is attached to the radiator assembly.
When energized, the glow relay allows electrical current
to the engine glow plugs.
1. Verify coil resistance between terminals 86 and 85
with a multimeter (ohms setting). Resistance should be
approximately 72 ohms (Fig. 13).
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 13
86 87
85 30
85 86
87
30
Start/PWR/ENG ETV/Fuel Pump Relays (Gasoline Engine Only)
The relays are attached to the control panel support.
When energized, the relays allow electrical current to
the specific circuits (see Chapter 9 - Foldout Drawings
in this manual).
1. Verify coil resistance between terminals 86 and 85
with a multimeter (ohms setting). Resistance should be
approximately 80 ohms (Fig. 14).
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 14
Hour Meter
1. Connect the positive (+) terminal of a 12 VDC source
to the positive terminal of the hour meter.
2. Connect the negative (- ) terminal of the voltage
source to the other terminal of the hour meter.
3. The hour meter should move 1/10 of an hour in six
minutes.
4. Disconnect the voltage source from the hour meter.
Figure 15
QUARTZ
Hobbs
HOURS
1
0000
1
10
+
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