APRILIA 8140172, Service And Repair Manual

Page: 241 / 279

ELECTRICAL SYSTEM
6 - 6
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6.3.1 CHECKING THE RECHARGING VOLTAGE
◆ Check battery voltage, see 2.4.2 (RECHARGING THE
BATTERY).
◆ Start the engine and let it run until it reaches 4000 rpm.
◆ Set the light switch to "
o
" and dimmer switch to “
b
”.
◆
_
Set the dimmer switch to “
b
”.
◆ Using a pocket tester, measure the direct voltage be-
tween the positive (+) and negative (–) terminals.
If the tester indicates voltage values lower than 13V or
higher than 15V:
◆ Check the loadless operation and the continuity of the
alternator, see 6.3.2 (CHECKING THE ALTERNATOR
LOADLESS OPERATION) and 6.3.3 (CHECKING THE
ALTERNATOR CONTINUITY). Also check the voltage
regulator, see 6.3.4 (CHECKING THE VOLTAGE REG-
ULATOR).
Wiring diagram key
NOTE
See 6.2 (ELECTRIC COMPONENTS LAYOUT)
for the positioning of the components.
18) Battery
19) Main fuse (30A)
20) Generator
22) Voltage regulator
30) Ignition switch (
n
-
m
-
s
)
Standard charging voltage:
13 to 15 V (d.c.) at 4000 rpm.
6.3.2 CHECKING THE ALTERNATOR LOADLESS
OPERATION
◆ Remove the rear fairing, see 7.1.36 (REMOVING THE
REAR FAIRING).
◆ Disconnect the voltage regulator three-way cable con-
nector (1) (coloured brown).
a
CAUTION
When reassembling, make sure the electric connec-
tor (1) is plugged in properly.
◆ Start the engine and let it run until it reaches 4000 rpm.
◆ Using a pocket tester, measure the voltage ( a.c. ) from
the three internal male terminals [yellow cables (G)] in
rotation.
If the value indicated by the tester is lower than 60 V,
the alternator is faulty and needs replacing.
Standard loadless voltage:
more than 60 V (
a.c. ) at 4000 rpm.