Charging Circuit; Alternator - JLG G5-18A Service Manual

Electrical System
Note: DO NOT disassemble the starter. The starter is
not serviceable and must be replaced in its entirety, if
defective.
f. Starter Installation
1. Position the starter in its mounting opening on the
flywheel housing. Position the ground cable over the
correct starter mounting bolt. Secure the starter with
fasteners. Torque fasteners to 32 lb-ft (43 Nm).
2. Connect the positive (+) battery cable to the upper
solenoid stud. Install the wires to the upper solenoid
stud, and secure with lockwasher and nut.
3. Connect the wire to the solenoid mounting stud.
4. Connect the battery negative (-) cable to the battery
negative (-) terminal.
5. Close and secure the battery and engine covers.
9.7

CHARGING CIRCUIT

Before using a battery charger, an attempt can be made
to recharge the battery by jump-starting the machine.
(Refer to the appropriate Operation & Safety Manual.)
Allow the engine to run, which will enable the alternator to
charge the battery.
If the engine alternator charging warning indicator
illuminates, perform the following checks:
1. Check the all battery cable connections at the
battery, and verify that they are clean and tight.
2. Check the external alternator wiring and
connections, and verify that they are in good
condition.
3. Check the fan belt condition and tension.
4. Verify that the alternator mounting hardware is tight.
5. Run the engine and check the alternator for noise. A
loose drive pulley, loose mounting hardware, worn or
dirty internal alternator bearings, a defective stator
or defective diodes can cause noise. Replace a worn
or defective alternator.
9-16
9.7.1

Alternator

a. Alternator Removal
1. Open the battery and engine covers.
2. Disconnect the positive (+) and negative (-) battery
cables at the battery terminals.
3. Label and disconnect the wires attached to the
alternator.
Note: Record how the alternator is installed to ensure
correct installation later.
4. Loosen the top mounting bolt (2), but don't remove it
at this time. This will allow the alternator to swivel
during belt removal.
2
3
5. Loosen the belt tensioning adjustment bolt (3) at the
bottom of the alternator to loosen the fan drive belt.
6. Remove the fan drive belt from the alternator.
7. Remove the lower mounting capscrew securing the
alternator to the lower mounting hole on the engine.
8. While supporting the alternator with one hand,
remove the upper mounting hardware from the
upper alternator mount. Remove the alternator from
the machine.
b. Alternator Installation
1. Position the alternator and align with the upper
alternator mount on the engine bracket. Insert the
upper mounting hardware through the alternator
mount. DO NOT tighten completely at this time.
MY2200
G5-18A, 2505