Honda CBR125RW - Service manual > Battery/Charging System

Electrical / Battery/Charging System

SYSTEM LOCATION

Battery/Charging System

SYSTEM DIAGRAM

Battery/Charging System

SERVICE INFORMATION

GENERAL

! WARNING

 

BATTERY CHARGING

BATTERY TESTING

Refer to the instruction of the Operation Manual for the recommended battery tester for details about battery testing. The recommended battery tester puts a "load" on the battery so the actual battery condition can be measured.

Recommended battery tester BM-210 or BATTERY MATE or equivalent

SPECIFICATIONS

Battery/Charging System

TROUBLESHOOTING

BATTERY IS DAMAGED OR WEAK

1. BATTERY TEST

Remove the battery.

Check the battery condition using a recommended battery tester.

RECOMMENDED BATTERY TESTER: BM-210 or BATTERY MATE or equivalent

Is the battery in good condition?

NO - Faulty battery

YES - GO TO STEP 2.

2. CURRENT LEAKAGE TEST

Install the battery.

Check the battery current leakage test (Leak test).

Is the current leakage below 0.1 mA?

YES - GO TO STEP 4.

NO - GO TO STEP 3.

3. CURRENT LEAKAGE TEST WITHOUT REGULATOR/RECTIFIER CONNECTOR

Disconnect the regulator/rectifier 6P (Black) connector and recheck the battery current leakage.

Is the current leakage below 0.1 mA?

YES - Faulty regulator/rectifier

NO -

4. CHARGING VOLTAGE INSPECTION

Measure and record the battery voltage using a digital multimeter.

Start the engine.

Measure the charging voltage.

Compare the measurements to the results of the following calculation.

STANDARD: Measured BV < Measured CV < 15.5 V

Is the measured charging voltage within the standard voltage?

YES - Faulty battery

NO - GO TO STEP 5.

5. ALTERNATOR CHARGING COIL INSPECTION

Check the alternator charging coil.

Is the alternator charging coil resistance within 0.2 - 0.6 Ω (20ºC/68ºF)?

YES - Faulty charging coil

NO - GO TO STEP 6.

6. REGULATOR/RECTIFIER SYSTEM INSPECTION

Check the voltage and resistance at the regulator/rectifier 6P (Black) connector.

Are the measurements correct?

YES - Faulty regulator/rectifier

NO -

BATTERY

REMOVAL/INSTALLATION

Remove the single seat.

Turn the ignition switch OFF.

Remove the trim clip and open the battery case cover.

Battery/Charging System

Disconnect the negative (-) cable first and then the positive (+) cable.

Remove the battery.

Connect the positive cable first and then the negative cable.

Install the battery in the reverse order of removal.

Battery/Charging System

VOLTAGE INSPECTION

Measure the battery voltage using a commercially available digital multimeter.

VOLTAGE (20ºC/68ºF):

Fully charged: 13.0 - 13.2 V
Under charged: Below 12.4 V

If the battery voltage is below 12.4 V, charge the battery.

Battery/Charging System

BATTERY TESTING

Refer to the instructions that are appropriate to the battery testing equipment available to you.

TOOL: Battery tester BM-210 or BATTERY MATE or equivalent

CHARGING SYSTEM INSPECTION

CURRENT LEAKAGE INSPECTION

Remove the single seat.

Open the battery case cover.

With the ignition switch turned OFF, disconnect the negative (-) cable.

Connect the ammeter (+) probe to the wire harness negative (-) cable and ammeter (-) probe to the battery negative (-) terminal.

With the ignition switch turned OFF, check for current leakage.

NOTE:

Battery/Charging System

SPECIFIED CURRENT LEAKAGE: 0.1 mA max.

If current leakage exceeds the specified value, a shorted circuit is likely.

Locate the short by disconnecting connections one by one and measuring the current.

CHARGING VOLTAGE INSPECTION

Remove the single seat.

Open the battery case cover.

Be sure the battery is in good condition before performing this test.

Warm up the engine to normal operating temperature.

Connect the multimeter between the battery positive (+) and negative (-) terminal.

NOTE:

Battery/Charging System

With the headlight high beam, measure the voltage on the multimeter when the engine runs at 5,000 min-1 (rpm).

STANDARD: Measured BV < Measured CV < 15.5 V

ALTERNATOR CHARGING COIL

INSPECTION

It is not necessary to remove the stator coil to perform this test.

Disconnect the alternator/CKP sensor 6P (Natural) connector.

Battery/Charging System

Measure the resistance between the Yellow wire terminals of the alternator side connector.

STANDARD: 0.2 - 0.6 Ω (20ºC/68ºF)

Replace the alternator stator if the resistance is out of specification, or if any wire has continuity to ground.

Battery/Charging System

REGULATOR/RECTIFIER

SYSTEM INSPECTION

It is not necessary to remove the stator coil to perform this test.

Turn the ignition switch OFF.

Disconnect the regulator/rectifier 6P (Black) connector, and check it for loose contacts or corroded terminals.

If the charging voltage reading is out of the specification, check the following at the wire harness side connector:

Battery/Charging System

Battery/Charging System

If all components of the charging system are normal and there are no loose connections at the regulator/ rectifier connector, replace the regulator/rectifier unit.

Battery/Charging System

REMOVAL/INSTALLATION

Remove the left middle cowl.

Disconnect the regulator/rectifier 6P (Black) connector.

Remove the bolts and regulator/rectifier from the frame.

Install the regulator/rectifier in the reverse order of removal.

Battery/Charging System

See also:

 Honda CBR125RW - Service manual > Electrical

 Honda CBR125RW - Service manual > Ignition System

SYSTEM LOCATION CLUTCH SWITCH IGNITION SWITCH IGNITION COIL ECM INJECTOR MAIN FUSE (30 A) BATTERY SUB FUSE SIDESTAND SWITCH NEUTRAL SWITCH CKP SENSOR SPARK PLUG

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