Voltage Regulator Rectifier for Honda XL600V XL400V Transalp 31600-MM9-000

Product Overview

Replace a damaged, overheated, or unstable voltage regulator rectifier with this 12V replacement unit, designed for select Honda XL600V Transalp 600, XL400V Transalp 400, and related adventure motorcycle applications using OEM reference numbers 31600-MM9-000 and 31600-MS6-921.

The voltage regulator rectifier is an important part of the motorcycle charging system. It helps regulate charging voltage before power reaches the battery and electrical components. A faulty regulator rectifier may cause weak charging, battery overcharging, repeated battery failure, dim lights, blown bulbs, unstable voltage, melted connectors, or charging system problems.

This replacement unit is designed for a standard 12V DC charging system and supports stable voltage output between 13.5V and 14.5V based on supplied product data. Please compare your original regulator rectifier’s OEM number, plug shape, wire layout, mounting hole spacing, body size, and overall appearance before ordering.

Product Compatibility

Make	Model	Year Range	OEM / Reference Number	Fitment Notes
Honda	XL600V Transalp 600 / PD06	1987–1999	31600-MM9-000 / 31600-MS6-921	Main fitment; confirm original regulator and connector layout
Honda	XLV600 / XL600 Transalp 600	1987–1999	31600-MM9-000 / 31600-MS6-921	Model-name variation used on some listings; verify original part
Honda	XL400V Transalp 400	1992–1994	31600-MM9-000 / 31600-MS6-921	Common related fitment; compare plug and mounting points
Honda	XLV400 Transalp 400	1992–1994	31600-MM9-000 / 31600-MS6-921	Model-name variation; match by OEM and connector
Honda	XRV650 Africa Twin / RD03	1988–1989	Verify original part	Possible related fitment only if OEM number, plug, and size match

Important Fitment Note:
This part is not selected by model name alone. Honda XL600V, XL400V, XLV400, XLV600, Transalp, and XRV650 models may use different regulator rectifiers depending on market, year, wiring harness, connector design, and charging system setup. Please confirm your original regulator rectifier matches OEM 31600-MM9-000 or 31600-MS6-921, the plug shape, wiring layout, 68mm mounting hole spacing, and body design before ordering.

Specifications

Specification	Details
Product Type	Voltage Regulator Rectifier
Compatible Brand	Honda
Main Compatible Models	XL600V Transalp 600, XL400V Transalp 400
Possible Related Model	XRV650 Africa Twin, verify before purchase
Voltage System	Standard 12V DC System
Stable Voltage Output	13.5V–14.5V
Mounting Hole Spacing	68mm / 2.67"
Main OEM References	31600-MM9-000 / 31600-MS6-921
Application	Motorcycle Charging System
Fitment Type	Replacement, match by OEM number, connector, and size
Material / Build	Heat-resistant, vibration-resistant, and wear-resistant housing, based on supplied product data

Key Features

• 12V voltage regulator rectifier for select Honda Transalp motorcycle charging systems
• Designed for matching XL600V Transalp 600 and XL400V Transalp 400 applications
• Replaces Honda regulator rectifier references 31600-MM9-000 and 31600-MS6-921
• Helps regulate charging voltage for stable electrical output
• Helps reduce weak charging, overcharging, dim lights, battery drain, and repeated battery failure
• Heat-resistant and vibration-resistant construction supports stable operation
• Direct replacement style, but original OEM number, plug shape, wiring layout, and mounting distance must be checked before installation

OEM Cross Reference

OEM / Reference Number	Notes
31600-MM9-000	Main Honda regulator rectifier reference
31600MM9000	Compact format of 31600-MM9-000
31600-MS6-921	Main Honda regulator rectifier reference
31600MS6921	Compact format of 31600-MS6-921

Please use the OEM/reference number together with physical dimensions and connector layout for fitment confirmation. If your original regulator rectifier has a different plug shape, different wire layout, different mounting hole distance, different body size, or different charging system design, this part may not fit.