Instrument And Light Circuits; General; Light Bulbs; Gauges And Indicators - Manitowoc Grove CD3340B Service Manual

CD3340B/YB4411
starter relay to the starter solenoid. Repair or replace the
wiring. If voltage is indicated, the problem is in the starter
solenoid.

INSTRUMENT AND LIGHT CIRCUITS

General

Power is available to the light switch from a 20 amp fuse on
the fuse block. The light switch has three positions. The
upper position illuminates the work lights, head lights, tail
lights, gauge lights and the instrument panel light. The center
position turns all lights off. The lower position illuminates the
head and tail lights, as well as, the instrument panel lights.

Light Bulbs

Table 3-2
Light Bulbs
Location Part No.
Panel Lights 71421
Head Lights --
Tail Lights --
Turn Signal --
Work Lights --
Mast Lights --

Gauges and Indicators

The gauges are 12 volt components. Power is available to
the gauges through a 5 amp fuse when the ignition switch is
in the ON position.
Fuel Gauge
The fuel gauge connects to a sending unit in the fuel tank.
This sending unit puts a variable resistance in the circuit and
causes a corresponding indication on the fuel gauge,
representing fuel level.
Engine Oil Pressure Indicator
This indicator connects to the engine ECM. The ECM
connects to a sending unit in the engine lubrication system.
When the oil pressure is below a predetermined value the
sending unit signals the ECM indicating engine oil pressure
is too low.
Engine Temperature Gauge
This gauge connects to the engine ECM. The ECM connects
to a sending unit in the engine cooling system. The variable
resistance caused by the sending unit gives a corresponding
indication of the temperature of the engine coolant.
GROVE
Voltmeter Display
The voltmeter is connected in parallel with the charging
circuit. The voltmeter gives an indication of electrical
charging system problems that can not be seen with an
ammeter.
Normally, when the engine is stopped (ignition switch in the
ON position) or when the engine is running at low idle, the
voltmeter will indicate 11-14 volts. When the engine is
running above low idle, the voltmeter will normally indicate
14-16 volts. More than 16 volts indicates an overcharging
condition, see Table 3-3.
Hour Meter
Power is available through the oil pressure switch on the
engine by way of the engine ECM. The hour meter operates
only when the engine is running.

ECM Display Toggle Switch

Trade No.
T-61
4411 Sealed
1157
1156
4411 Sealed
4411 Sealed
The Display Toggle Switch is used to display engine ECM
error codes. With the engine running, press the button and
no engine codes are present the display cluster will read "No
Errors Detected". If a single error code is present, it will be
displayed when the button is pressed. If multiple error codes
are present, the display will list in the parentheses the
number of error codes and will scroll through them in order of
occurrence each time the button is depressed.
Published 04/07/2015 Control # 569-00
ELECTRIC SYSTEM
FIGURE 3-6
3-9
3