GROVE Published 1-20-2017, Control# 483-02 3-21
CD5515-2/YB5515-2 SERVICE MANUAL ELECTRIC SYSTEM
TROUBLESHOOTING
Finding a problem in the electrical system is not difficult if you
know basic electricity and understand the arrangement of
the electrical system. Use the wiring diagrams at the end of
this manual as your guide.
Accurate testing equipment is also necessary. The
instruments normally used are a voltmeter, ammeter,
ohmmeter and test light.
Many times the problem can be found by visual inspection of
the components in the circuit. Corrosion on terminals, loose
connections or bad wiring are the causes of many problems.
Each circuit in the system has a fuse for protection against
overloads. Remember that a burnt fuse is an indication of an
overload or SHORT circuit, not an OPEN circuit.
If you did not find the cause of the problem during the visual
inspection, use a voltmeter to check the voltage at several
points in the circuit, or measure voltage drop across the
component. Normally, the best method is to start at the
furthest component in the circuit and move backwards
toward the power supply. An ohmmeter can be used to
measure the resistance in any component. Remember to
disconnect the component from the power supply before you
connect the ohmmeter.
Table 3-4
Charging System Troubleshooting
Problem Possible Cause Solution
Alternator does not charge. 1. Alternator belt loose or broken. 1. Replace and/or tighten to
specification.
2. Worn brushes or open brush leads
or connections.
2. Replace or repair alternator.
3. Open circuit, short circuit or
ground stator winding.
3. Replace alternator.
4. Fault in voltage regulator. 4. Replace voltage regulator.
5. Short circuit or open circuit in
rectifier diodes.
5. Replace or repair alternator.
6. Open circuit or short circuit in rotor
(field) winding.
6. Replace alternator.
7. Wires connected wrong, loose, or
broken.
7. See wiring diagram. Repair or
replace wires.
8. Dirty slip rings or bad slip ring
connections.
8. Inspect slip rings. Clean or repair
as required.
High charging rate (battery at full
charge).
1. Low electrolyte level in battery. 1. Add distilled water.
2. Fault in wiring system. 2. Repair or replace faulty wiring.
3. Loose or dirty connections. 3. Clean and tighten connections.
4. Malfunction in voltage regulator. 4. Replace voltage regulator.
Low charging rate. 1. Loose or worn alternator belt. 1. Adjust or replace belt.
2. Bad alternator. 2. Replace or repair.
3. Bad battery. 3. Replace battery.
4. Low electrolyte level. 4. Add distilled water.
5. Short circ
uit
in system. 5. Check and repair.
6. Worn alternator. 6. Test, replace or repair alternator.
7. Malfunctioning voltage regulator. 7. Replace the voltage regulator.
8. Low engine speed. 8. Run engine at higher speed.
Reference Only
To Next Page
Loading...
Need help?
General
