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Table of Contents
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 | 2000K | Diode |
DT9806 | 200kΩ | 2MΩ | Diode |
Here are the pictures of the three multimeters:
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 alternator coils)
- Disconnect the 4P white connector (Red/White, Red/White, Green, Green: to battery, positive and negative)
Measures on the wire harness and alternator 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 | Alternator 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 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 this 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 alternator (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:
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
You can measure the A.C. voltage generated by each of the three alternator coils with a multimeter at the black 3P connector, measuring each of the three yellow wires two by two. Each coil should produce about 6 V (A.C.) at 3000 rpm.