Mazda CX-9 Grand Touring 2009 Manual page 560

value.
1. Verify that the battery is fully charged.
2. Verify that the generator and A/C drive belt deflection/tension is correct. (See DRIVE BELT
INSPECTION [MZI-3.7] .)
3. Disconnect the negative battery cable.
4. Connect a tester, which can read 120 A or more , between generator terminal B and the wiring harness.
5. Connect the negative battery cable.
6. Turn off all electrical loads.
7. Start the engine.
8. Increase engine speed to 2,500 rpm .
NOTE:
9. Turn the following electrical loads on and verify that the current reading increases more than the
minimum value indicated below.
Headlights (high-beam)
Blower motor (HI)
Rear window defroster
Brake lights
Generator generated current minimum value
70 % of the nominal output current (nominal output current: 110 A)
[Ambient temp. 20°C {68 °F}, voltage 13.0-15.0 V, both engine and generator are hot]
GENERATOR INNER PARTS
Rotor
1. Measure the resistance between the slip rings using a tester.
If not within the specification, replace the rotor.
Generator rotor resistance (between slip rings) [20 °C {68 °F}]
2008 Mazda CX-9 Grand Touring
2008 ENGINE Charging System (MZI-3.7) - Mazda CX-9
When the electrical load on the vehicle is low, the specified current
cannot be verified although the generator is normal. In this case,
increase the electrical load (Leave the headlights turned on for a
while, then discharge the battery, or use a similar method.) and
recheck.
When the generator itself or the ambient temperature are too high,
the specified current also cannot be verified. In this case, cool down
the generator and recheck.