3-8 Published 08-25-09, Control # 077-04
ELECTRICAL SYSTEM RT9130E SERVICE MANUAL
4. The following circuit designs apply (connecting wiring
and passage through superstructure and carrier
modules -- as applicable -- is understood):
- Voltmeter. Fuse F14, voltmeter, ground. Branch for
reading from batteries.
- Fuel level gauge. Fuse F14, gauge. Gauge is
grounded. Branch from gauge to sending unit in fuel
tank to ground.
- Transmission oil temperature gauge. Fuse F14,
gauge. Gauge is grounded. Branch from gauge to
temperature sending unit to ground.
- Engine coolant temperature gauge. Fuse F14,
gauge. Gauge is grounded. Branch from gauge to
coolant temperature sending unit to ground.
- Tachometer. Fuse F14, tachometer. Meter is
grounded. Branch from tachometer to tachometer
sender to ground.
- Hourmeter. branch from carrier control module,
hourmeter, ground.
5. Repair is straightforward. For a gauge or meter, remove
gauge or meter, install new gauge or meter, install new
fuse, then test gauge or meter. For a sender, remove
sender, install new sender, install new fuse, then test
sender and gauge or meter. See INSTRUMENT
REPLACEMENT in this section for details on removing
and installing gauges and meters.
Troubleshooting Alarms, Indicators, and
Emergency Components
1. If an indicator won’t work when it is supposed to, check
its lamp first. Replace any defective lamp. Then check
and replace fuse as applicable, especially if all other
components downstream from the fuse are not working.
2. If an alarm or an emergency component won’t work
when it is supposed to, check and replace fuse,
especially when all other components downstream from
the fuse are not working.
3. Check the alarm or indicator or emergency component,
its sensing component, and circuit for continuity
problems and other problems. Repair any faulty alarm or
indicator or emergency component or sensing device
(switch, sending unit). Repair wiring if faulty.
4. The following circuit designs apply (connecting wiring
and passage through superstructure and carrier
modules, as applicable, is understood):
- Backup light and backup alarm. Fuse F8, electric
shifter, then to backup alarm in parallel with reverse
solenoid, then from lights and alarm to ground.
Lights circuit parallel with backup alarm and reverse
solenoid circuits.
- Park brake indicator. Fuse F10, indicator, normally
closed park brake pressure switch, ground.
- Low brake pressure alarm light. Fuse F14, alarm
light, brake pressure switch, ground.
- Rear wheels not centered indicator. Fuse F14,
indicator, rear steer not centered switch, ground.
- Engine stop indicator (such as low oil level, high
engine coolant temperature) alarm. Fuse F14,
buzzer and parallel indicator; ground controlled by
Cummins ECU.
- Engine warning indicator (engine service, engine
warning, water in fuel, wait to start). Fuse F14,
indicator, switch, ground controlled by Cummins
ECU.
- Axle differential lock indicator. Fuse F10, indicator,
switch(s) on axle(s), ground.
- Steering wheel horn. Horn switch, ground.
Superstructure control module, horn, ground.
- Swing brake on indicator. Fuse F13, swing brake
release switch, indicator, ground.
- Low brake pressure alarm circuit. Fuse F14,
indicator, switch, ground. Parallel buzzer circuit fuse
F14, buzzer, switch, ground.
- Low steer pressure for CE units. Fuse F14,
indicator, switch, ground. Parallel buzzer circuit fuse
F14, buzzer, switch, ground.
- Hose reel brake on alarm circuit. Fuse F14,
indicator, switch, ground. Parallel buzzer circuit fuse
F14, buzzer, switch, ground.
- Transmission service (low oil pressure, high oil
temp) alarm. Fuse F14, buzzer and parallel
indicator; ground. Branch to oil pressure switch to
ground, branch to oil temperature switch to ground.
5. Repair is straightforward.
a. ALARM: Remove blown fuse, remove faulty alarm
or faulty sensor (switch, sending unit), install new
alarm or sensor, install new fuse, test alarm.
b. INDICATOR: Remove blown fuse, remove faulty
light or faulty sensor (switch, sending unit), install
new light or sensor, install new fuse, test indicator.
c. BACKUP LIGHT: Remove blown fuse, remove
faulty light or faulty sensor (electric shifter), install
new light or sensor, install new fuse, test lights.
d. HORN: Remove blown fuse, remove faulty horn or
faulty trigger (switch, relay), install new horn or
trigger, install new fuse, test horn.
e. BUZZER: Remove blown fuse, remove buzzer,
install new buzzer, install new fuse, test buzzer.
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