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--- tecnica:motori:honda_ntv650_regulator_troubleshooting [2025/07/30 17:59] – [Honda NTV650 Revere - Regulator/Rectifier trubleshooting] niccolo
+++ tecnica:motori:honda_ntv650_regulator_troubleshooting [2025/08/01 18:35] (current) – [Measures on the the regulator/rectifier side] niccolo
@@ Line 1: / Line 1: @@
-====== Honda NTV650 Revere - Regulator/Rectifier trubleshooting ======
+====== Honda NTV650 Revere - Regulator/Rectifier troubleshooting ======
+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 reading were made with the **kΩ** scale, others were made using the **diode** setting:
+^  Digital multimeter  ^  Ranges to be used  ^^
+| Kowa 07411-0020000   |  CDI Ω Rx100  ||
+| DT-182 Mini          |  200K   |  Diode  |
+| DT9806               |  200kΩ  |  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}}
+{{:tecnica:motori:honda_ntv650:multimeters:dt-182-multimeter.jpg?direct&120|DT-182 Mini}}
+FIXME
-^  Digital multimeter  ^  Ranges  ^^
-| Kowa 07411-0020000   |  RX100  ||
-| DT-182 Mini          |  2000K  |  200K  |
-| DT9806               |  2MΩ    |  200kΩ |
 ===== 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)
+  * Disconnect the **3P black connector** (Yellow, Yellow, Yellow: The three-phase **alternator coils**)
-  * Disconnect the **4P white connector** (Red/White, Red/White, Green, Green)
+  * Disconnect the **4P white connector** (Red/White, Red/White, Green, Green: to battery, **positive** and **negative**)
-==== Measures on the wire harness and generator side ====
+==== Measures on the wire harness and alternator side ====
 The **female connectors** are attached to the wire harness and to the generator.
@@ Line 21: / Line 41: @@
 | Yellow      | Yellow       | Alternator coils: 0.1~1.0 Ω at 20 °C  |
 | Yellow      | Ground       | No continuity  |
 ==== Measures on the the regulator/rectifier side ====
@@ Line 27: / Line 46: @@
 The **male connectors** are attached to the regulator/rectifier.
-^  ^^  Kowa  ^  DT-182  ^^  DT9806  ^^
+^  ^^  Kowa  ^  DT-182  ^^^  DT9806  ^^^
-^  (+) Probe  ^  (-) Probe   ^  RX100  ^  2000K  ^  200K  ^  2MΩ  ^  200kΩ  ^
+^  (+) Probe  ^  (-) Probe   ^  RX100  ^  200K  ^  2000K  ^  Diode  ^  200kΩ  ^  2MΩ  ^   Diode  ^
-| Red/White  | Green       |  5~30 |      0.032 |  32.3 |      0.032 |  32.6 |
+| Red/White  | Green       |  5~30 |  32.3 |     - |    - |  32.6 |     - |    - |
-| Red/White  | Yellow 1    |  1~20 |  1520~1840 |     ∞ |    710~790 |   195 |
+| Red/White  | Yellow 1    |  1~20 |     - |  1810 |    ∞ |     - |  .780 |    ∞ |
-| Red/White  | Yellow 2    |  1~20 |  1520~1840 |     ∞ |    710~790 |   195 |
+| Red/White  | Yellow 2    |  1~20 |     - |  1810 |    ∞ |     - |  .780 |    ∞ |
-| Red/White  | Yellow 3    |  1~20 |  1520~1840 |     ∞ |    710~790 |   195 |
+| Red/White  | Yellow 3    |  1~20 |     - |  1810 |    ∞ |     - |  .780 |    ∞ |
-| Green      | Read/White  |     ∞ |      0.031 |  32.2 |      0.032 |  32.5 |
+| Green      | Read/White  |     ∞ |  32.2 |     - |    - |  32.5 |     - |    - |
-| Green      | Yellow 1    |     ∞ |     1780~∞ |     ∞ |  0.66~0.73 |   132 |
+| Green      | Yellow 1    |     ∞ |     - |     - |  427 |     - |     - |  518 |
-| Green      | Yellow 2    |     ∞ |     1780~∞ |     ∞ |  0.66~0.73 |   132 |
+| Green      | Yellow 2    |     ∞ |     - |     - |  427 |     - |     - |  518 |
-| Green      | Yellow 3    |     ∞ |     1780~∞ |     ∞ |  0.66~0.73 |   132 |
+| Green      | Yellow 3    |     ∞ |     - |     - |  427 |     - |     - |  518 |
-| Yellow 1   | Read/White  |     ∞ |     1710~∞ |     ∞ |  0.65~0.72 |   129 |
+| Yellow 1   | Read/White  |     ∞ |     - |     - |  427 |     - |     - |  518 |
-| Yellow 1   | Green       |  1~20 |          ∞ |     ∞ |  0.70~0.77 |   192 |
+| Yellow 1   | Green       |  1~20 |     - |  1735 |    ∞ |     - |  .762 |    ∞ |
-| Yellow 1   | Yellow 2    |     ∞ |          ∞ |     ∞ |          ∞ |     ∞ |
+| Yellow 1   | Yellow 2    |     ∞ |     - |     - |      |     ∞ |     - |    ∞ |
-| Yellow 1   | Yellow 3    |     ∞ |          ∞ |     ∞ |          ∞ |     ∞ |
+| Yellow 1   | Yellow 3    |     ∞ |     - |     - |      |     ∞ |     - |    ∞ |
-| Yellow 2   | Read/White  |     ∞ |     1710~∞ |     ∞ |  0.65~0.72 |   129 |
+| Yellow 2   | Read/White  |     ∞ |     - |     - |  427 |     - |     - |  518 |
-| Yellow 2   | Green       |  1~20 |          ∞ |     ∞ |  0.70~0.77 |   192 |
+| Yellow 2   | Green       |  1~20 |     - |  1735 |    ∞ |     - |  .762 |    ∞ |
-| Yellow 2   | Yellow 1    |     ∞ |          ∞ |     ∞ |          ∞ |     ∞ |
+| Yellow 2   | Yellow 1    |     ∞ |     - |     - |      |     ∞ |     - |    ∞ |
-| Yellow 2   | Yellow 3    |     ∞ |          ∞ |     ∞ |          ∞ |     ∞ |
+| Yellow 2   | Yellow 3    |     ∞ |     - |     - |      |     ∞ |     - |    ∞ |
-| Yellow 3   | Read/White  |     ∞ |     1710~∞ |     ∞ |  0.65~0.72 |   129 |
+| Yellow 3   | Read/White  |     ∞ |     - |     - |  427 |     - |     - |  518 |
-| Yellow 3   | Green       |  1~20 |          ∞ |     ∞ |  0.70~0.77 |   192 |
+| Yellow 3   | Green       |  1~20 |     - |  1735 |    ∞ |     - |  .762 |    ∞ |
-| Yellow 3   | Yellow 1    |     ∞ |          ∞ |     ∞ |          ∞ |     ∞ |
+| Yellow 3   | Yellow 1    |     ∞ |     - |     - |      |     ∞ |     - |    ∞ |
-| Yellow 3   | Yellow 2    |     ∞ |          ∞ |     ∞ |          ∞ |     ∞ |
+| Yellow 3   | Yellow 2    |     ∞ |     - |     - |      |     ∞ |     - |    ∞ |
+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 alternator (credits to [[https://www.homemade-circuits.com/3-phase-motorcycle-voltage-regulator/|www.homemade-circuits.com]]), use it 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.
+==== Alternator voltage ====
+FIXME
+===== 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://youtube.com/watch?v=mn6RtpdmeQE&feature=shared|How To Test A Regulator Rectifier (Motorcycle)]]** - Video