The Honda 31710-ZB4-003 Diode Assembly is a genuine OEM component designed for Honda EM3500 and EM5000 generators. As a direct Honda OEM part, it is manufactured to the same specification as the original, ensuring the electrical system performs exactly as intended. This assembly is the correct replacement for both the EM3500 and EM5000 — confirm your generator's serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks and the correct assembly varies by production range.
Key Features
- Genuine OEM Rectification — Honda-sourced diode assembly provides the same electrical characteristics as the original, keeping AC-to-DC conversion accurate and protecting sensitive generator circuits.
- Direct OEM Replacement — part number 31710-ZB4-003 is a drop-in replacement that connects to the existing wiring harness without modification.
- Fits EM3500 and EM5000 Generators — confirmed for Honda EM3500 and EM5000 conventional generators; verify your serial number against the fitment table to ensure this assembly applies to your unit.
- Restores Proper Output — a failed diode assembly can cause loss of DC output, battery charging failure, or unstable generator performance; replacing it with this OEM part restores correct operation.
The diode assembly in a conventional generator rectifies the alternating current produced by the alternator into direct current, supplying the battery charging circuit and any DC loads the generator supports. It also plays a role in the automatic voltage regulator circuit, helping stabilize output voltage under varying loads. When the diode assembly fails — through heat stress or age — the generator may lose its DC charging output entirely, or produce erratic AC voltage, leaving connected equipment unprotected.
Part Details
| Part Number | 31710-ZB4-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Diode Assembly |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EM3500, EM5000 | All |
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.
