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--- tecnica:motori:honda_ntv650_regulator_troubleshooting [2025/07/31 09:18] – [Honda NTV650 Revere - Regulator/Rectifier troubleshooting] niccolo
+++ tecnica:motori:honda_ntv650_regulator_troubleshooting [2025/07/31 12:48] (current) – [Measures on the the regulator/rectifier side] niccolo
@@ Line 1: / Line 1: @@
 ====== Honda NTV650 Revere - Regulator/Rectifier troubleshooting ======
-The regulator/rectifier is a semiconductor device; using different testers will result in different readings. Also using a different range (scale) with the same tester will result in different readings.
+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 obtained using the **Kowa 07411-0020000** digital multimeter on the RX100 scale. The values obtained with the **DT-182** and **DT9806** digital multimeters were measured by me instead. I repeated the measures using two different scales on both multimeters:
+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   |  RX100  ||
+| 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
 ===== 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 25: / 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 53: / Line 68: @@
 | Yellow 3   | Yellow 1    |     ∞ |     - |  |     ∞ |    ∞ |
 | Yellow 3   | Yellow 2    |     ∞ |     - |  |     ∞ |    ∞ |
+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