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tecnica:motori:honda_ntv650_regulator_troubleshooting

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Honda NTV650 Revere - Regulator/Rectifier troubleshooting

The Honda NTV Revere mounted different rectifiers across the years (e.g. models NTV650J, NTV650K and NTV650L). They have the OEM part numbers 31600MS9000, 31600MS9003 and 31600MS9010. They should all be interchangeable because they are mounted with the same stator (part 31120MS9004) and the same battery.

The regulator/rectifier is a semiconductor device; you can use a multimeter to check its health status, but using different testers will result in different readings. Also using a different range (scale) with the same tester will result in different readings.

The Honda workshop manual for the NTV 650 Revere gives the reading values that should be obtained using the Kowa 07411-0020000 digital multimeter on the Rx100 scale. That multimeter is specifically manufactured for Honda and it has two special scales marked as Rx100 and Rx1 respectively, grouped under the label CDI Ω. These two scales are specifically calibrated to measure the devices of a capacitor discharge ignition.

Because I don't have the Kowa multimeter, I used a DT-182 mini multimeter and a DT9806 one instead. In this page I give the values measured by those multimeters, some readings were taken on the scale, some on the scale, and some on the diode mode.

Digital multimeter Ranges to be used
Kowa 07411-0020000 CDI Ω Rx100
DT-182 Mini 200K 2000K Diode
DT9806 200kΩ 2MΩ Diode

Here are the pictures of the three multimeters:

Kowa KE-32-3 07411-0020000 DT-182 Mini DT9808

Regulator/rectifier inspection (with engine off)

Battery ampere leackage

Turn the ignition switch to off and disconnect the negative terminal from the battery; connect the multimeter in series to close the circuit. The multimeter must be on the ampere scale and it should read a leackage of max 0.1 A at 20 °C.

With the regulator/rectifier disconnected

The regulator/rectifier connectors are behind the right side cover.

  • Disconnect the 3P black connector (Yellow, Yellow, Yellow: The three-phase generator coils)
  • Disconnect the 4P white connector (Red/White, Red/White, Green, Green: to battery, positive and negative)

Measures on the wire harness and generator side

The female connectors are attached to the wire harness and to the generator.

(+) Probe (-) Probe Reading
Red/White Green Battery voltage: fully charged 13.0~13.2, undercharged if < 12.3.
Yellow Yellow Generator coils: 0.1~1.0 Ω at 20 °C
Yellow Ground No continuity

Using the DT-182 Mini multimeter on the 200 Ω scale, the reading with the terminals shorted is 0.4 Ω, measuring each coil (yellow-yellow) the reading is 0.8 Ω instead.

Measures on the the regulator/rectifier side

The male connectors are attached to the regulator/rectifier.

Kowa DT-182 DT9806
(+) Probe (-) Probe RX100 200K 2000K Diode 200kΩ 2MΩ Diode
Red/White Green 5~30 32.3* - 32.6* -
Red/White Yellow 1 1~20 - 1770 - .770
Red/White Yellow 2 1~20 - 1770 - .770
Red/White Yellow 3 1~20 - 1770 - .770
Green Read/White 32.2* - 868 32.5* - 880
Green Yellow 1 - - 427 - - 518
Green Yellow 2 - - 427 - - 518
Green Yellow 3 - - 427 - - 518
Yellow 1 Read/White - - 427 - - 518
Yellow 1 Green 1~20 - 1770 - .770
Yellow 1 Yellow 2 - - -
Yellow 1 Yellow 3 - - -
Yellow 2 Read/White - - 427 - - 518
Yellow 2 Green 1~20 - 1770 - .770
Yellow 2 Yellow 1 - - -
Yellow 2 Yellow 3 - - -
Yellow 3 Read/White - - 427 - - 518
Yellow 3 Green 1~20 - 1770 - .770
Yellow 3 Yellow 1 - - -
Yellow 3 Yellow 2 - - -

*) NOTICE: Only older Honda part 31600MS9000 measure the resistance value, newer part 31600MS9003 measure ∞.

Values measured on the diode scale may vary by +/- 2%, values measured on the MΩ scale may vary by +/- 5%.

The following picture represents the schematic of a generic regulator/rectifier for a three-phase generator (credits to www.homemade-circuits.com), it is not the schematic of the Honda part, use it just to understand how the rectifier diodes are tested:

Motorcycle regulator/rectifier schematic

Regulator/rectifier inspection (with running engine)

Charging voltage

With the ignition switched off, measuring the voltage at the terminals of the fully charged battery should read 13.0~13.2 V. A value below 12.3 V means an under charged battery.

Starting the engine and gradually increasing the speed to 3000 rpm, should read a voltage of 13.5~15.5 V at 20 °C. This is the standard charging voltage for an AGM battery.

Charging current

Remove the main fuse and connect a multimeter in series to close the circuit. The multimeter must be on the ampere scale. Starting the engine and gradually increasing the speed to 3000 rpm, should read a current of 0.5 A at 20 °C. This is the standard charging current for an AGM battery.

Generator voltage

You can measure the A.C. voltage generated by each of the three generator coils with a multimeter at the black 3P connector, measuring each of the three yellow wires two by two.

  • Disconnect both the black 3P and the white 4P connectors of the rectifier.
  • The battery must be charged enough to allow the engine to run for a minute or two, without the generator providing power.
  • Start the engine and connect the multimeter to the 3P black female connector (three yellow wires), pairing the wires two by two; i.e. testing 1-2, 1-3 and 2-3.
  • Each coil should produce about 26 V (A.C.) at 3000 rpm.

Web References

tecnica/motori/honda_ntv650_regulator_troubleshooting.1754256632.txt.gz · Last modified: by niccolo