ELECTRICAL SYSTEM GRT8100 SERVICE MANUAL
3-16
Published 3/26/2018, Control # 596-05
1. Open battery compartment door.
1. Ensure key switch has been in the OFF position for 2
minutes.
2. Turn battery disconnect switch to OFF position.
3. Remove ECM power fuse.
4. Remove negative battery cables.
5. Remove positive battery cables.
6. Remove nuts and washers from bracket hold down rods.
Remove hold down bracket.
7. Remove batteries.
Installation
1. Place batteries in battery compartment.
2. Install hold down bracket. Secure bracket (and batteries)
to bracket hold down rods with nuts and washers.
3. Connect leads to battery terminals starting with the
positive terminals.
4. Install ECM power fuse.
5. Close battery compartment door.
6. Turn battery disconnect switch ON.
7. Verify replacement batteries work by starting crane’s
engine and operating various crane components.
Relay Panel Components
Accessory Relay
1. Ensure key switch has been in OFF position for 2
minutes.
2. Turn battery disconnect switch to OFF position.
3. Behind operators seat, loosen thumbscrews securing
panel cover. Lower cover.
4. Tag and disconnect electrical leads from suspect relay.
5. Remove hardware securing suspect relay to relay panel
assembly. Remove relay.
6. Install replacement relay on relay panel and secure it
with attaching hardware.
7. Connect electrical leads to relay as tagged during
removal.
8. Raise cover and secure with thumbscrews.
9. Verify proper installation by operating all components
connected to replacement relay.
Buzzer Replacement
1. Behind operators seat, loosen thumbscrews securing
panel cover. Lower cover.
2. Tag and disconnect electrical leads from buzzer.
3. Unscrew plastic collar ring under panel. Remove buzzer
from hole in panel.
4. Install new buzzer through hole in panel and secure with
plastic collar ring.
5. Connect electrical leads to buzzer as tagged during
removal.
6. Raise cover and secure with thumbscrews.
7. Verify proper operation by placing ignition switch to RUN
(1). Buzzer should sound when engine is not running.
Steering Column and Dashboard
Rocker Switch
Refer to Figure 3-11.
Removal
1. Ensure key switch has been in OFF position for 2
minutes.
2. Turn battery disconnect switch to OFF position.
NOTE: Only remove as much as needed to access switch
being replaced.
3. Remove four screws (11) from dashboard cover (1).
4. Remove locking lever (15).
5. Remove four screws (14) from left side cover (16).
6. Remove left side cover (16) from steering column.
7. Disconnect wire harness from back of ignition switch
(12).
8. Remove right side cover (10) from steering column
assembly (9).
9. Disconnect wire harness (not shown) from bottom of
switch to be replaced (19 – 24). Remove switch by
squeezing retaining clips on each side of switch and
pushing upwards until switch is free of cover.
Inspection
1. Visually check switch for evidence of cracks, damaged
connections, or other damage. Replace switch as
needed.
2. Check wiring for damaged insulation or damaged
connectors. Repair as needed.
3. Check all connectors for corrosion. Replace corroded
components as needed.
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