====== 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 **kΩ** scale, some on the **kΩ** 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: {{.:honda_ntv650:multimeters:kowa-ke-32-3-multimeter.jpg?direct&150|Kowa KE-32-3 07411-0020000}} {{.:honda_ntv650:multimeters:dt-182-multimeter.jpg?direct&120|DT-182 Mini}} {{.:honda_ntv650:multimeters:digital-multimeter-dt9808.jpg?direct&100|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 [[https://www.homemade-circuits.com/3-phase-motorcycle-voltage-regulator/|www.homemade-circuits.com]]), **it is not the schematic of the Honda part**, use it just to understand how the rectifier diodes are tested: {{.:honda_ntv650:multimeters:motorcycle-regulator-rectifier.png?direct&480|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 ===== * **[[https://www.ittsb.eu/forum/index.php?topic=1851.0|What is KOWA KS-AHM-32-003 Digital multimeter by HONDA recommended CDI tester?]]** * **[[https://electronicshacks.com/how-to-test-a-stator-with-a-multimeter/|How to Test a Stator With a Multimeter?]]** * **[[https://www.motorcycleforum.com/threads/testing-a-3-phase-alternator-stator-r-r-and-battery.245315/|Testing a 3 Phase Alternator-Stator-R/R And battery]]** * Video: **[[https://youtube.com/watch?v=mn6RtpdmeQE|How To Test A Regulator Rectifier (Motorcycle)]]** * Video: **[[https://youtube.com/watch?v=-5gBeW9mQoY|How to Test the Stator on a Motorcycle, ATV, or UTV]]** * Video: **[[https://youtube.com/watch?v=H5ZU_c2a1pA|How to Test the Charging System on a Honda CBR 600 RR]]**