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Kawasaki KZ500 Manual Page 190

1979-1985.
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Table of Contents
CHAPTER EIGHT
Battery
should be above 12 volts. If not, charge the
battery. If the battery is okay and all
connections are clean and tight, inspect the
charging system.
Initial Inspection
1. Start the engine and let it reach normal
operating temperature.
2. Connect a 0-20 DC voltmeter to the battery
as shown in Figure 24. Bring the engine speed
from idle to 4,000 rpm, observing the voltage
as you go.
3. Turn the headlight on and off, observing the
voltage.
NOTE
l f
your bike doesn't have a headlight
switch, disconnect a wire to the headlight
or remove and reinstall the headlight
fuse.
4. The voltage should be at or near battery
voltage at idle and it should increase with
engine speed. up to about 14.5 volts. If the
reading is much higher (more than about 16
volts), the regulator/rectifier is defective and
should be replaced. If the reading is less than
specified or does not increase with rpm, check
the alternator output and resistance and
regulatorhectifier resistance.
Alternator Output Test
1. Remove the engine sprocket cover; see
Sprocket Cover Removal in Chapter Six.
2. Disconnect the yellow leads from the
alternator (Figure 25).
3. On models with 3 yellow leads from the
alternator: Start the engine and connect an AC
voltmeter (0-250 volts) to every pair of yellow
leads in turn (there are 3 combinations). The
meter should read about 75 volts AC. If it is
much lower, the alternator is defective. Check
stator coil resistance.
4. On models with 2 yellow leads from the
alternator: Start the engine and connect an AC
voltmeter (0-250 volts) to the pair of yellow
leads. The meter should read about 50 volts
AC. If it is much lower, the alternator is
defective. Check stator coil resistance.
Stator Coil Resistance
1. On models with 3 yellow leads from the
alternator: With the engine off and an
ohmmeter set on a
1
ohm scale. check
resistance between every pair of yellow leads in
turn (there are 3 combinations). The resistance
should be about 0.3-0.5 ohms.
2. On models with 2 yellow leads from the
alternator: With the engine off and an
ohmmeter set on
a
1 ohm scale, check
resistance between the yellow leads. The
resistance should be about 0.5-0.7 ohms.
3. Set the ohmmeter on the highest scale and
check resistance between each yellow lead and
ground. Resistance should be infinite.
4. If the stator coil resistance is okay, but
alternator output is low, the rotor has probably
been demagnetized. Replace the rotor; see
Rotor Removal in this chapter.
Regulator/Rectifier Resistance
1. Remove the left-hand side cover and open
the electrical panel (Figure 1).
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