The Honda 31700-Z22-A31 Automatic Voltage Regulator Assembly is a genuine OEM component designed for Honda EB3800, EB4000, EB5000, EB6500, EM3800, EM4000, EM5000, and EM6500 generators. As a direct Honda OEM part, it meets the same specifications as the original unit it replaces, making it the straightforward choice when the AVR on your generator needs swapping out. Always verify your generator's model and serial number against the fitment table before ordering, as Honda updates part numbers at production serial breaks.
Key Features
- Genuine OEM Voltage Regulation — sourced directly from Honda, this assembly delivers the same output stability as the original, keeping generator voltage steady under varying load conditions.
- Direct OEM Replacement — engineered to drop into the same position as the factory unit on EB and EM series generators, using the original mounting points and electrical connections.
- Broad Generator Compatibility — fits EB3800, EB4000, EB5000, EB6500, EM3800, EM4000, EM5000, and EM6500 generators, covering Honda's mid- to high-output conventional generator lineup.
- Serial Number Verification Recommended — Honda supersedes AVR assemblies at specific serial breaks; confirm your unit's serial number against the fitment table to ensure part number 31700-Z22-A31 is the correct match for your machine.
- Protects Connected Equipment — a failing AVR causes voltage to fluctuate or spike, which can damage sensitive tools and electronics powered by the generator; replacing a worn regulator restores clean, stable output.
The Automatic Voltage Regulator Assembly is the component responsible for maintaining steady AC output voltage on a conventional generator. It monitors the alternator's output and continuously adjusts the excitation current fed to the field windings, compensating for changes in load so that connected equipment receives consistent voltage rather than spikes or drops. When an AVR fails or degrades, the generator may produce erratic voltage, cause lights to flicker, trip sensitive equipment, or in severe cases deliver damaging surges — replacing it restores the stable power output these generators are built to provide.
Part Details
| Part Number | 31700-Z22-A31 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Automatic Voltage Regulator Assembly |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EM3800, EM4000, EM5000, EM6500 | 1010338-9999999 |
| Generator | EB3800, EB4000, EB5000, EB6500 | 1016674-9999999 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
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