The Honda 31720-ZA8-013 DC Diode is a genuine OEM electrical component designed for a wide range of Honda generators and RV generators, including the EB, EG, EM, ES, EV, and EX series. As a direct Honda OEM part, it is manufactured to the same specifications as the original component installed at the factory, ensuring correct electrical performance in the charging and rectification circuit. This diode is confirmed to fit models including the EB5000, EG5000, EM5000, EM6500, ES6500, EV4010, EX5500, and many others — verify part number 31720-ZA8-013 against your unit's serial number before ordering, as Honda supersedes components at serial production breaks.
Key Features
- Genuine OEM Electrical Integrity — sourced directly from Honda, this DC diode meets the original rectification and current flow specifications required by the generator's charging circuit, not a general-tolerance substitute.
- Broad Generator Compatibility — fits an extensive range of Honda conventional generators and RV generators across the EB, EG, EM, ES, EV, and EX families, including EB2500, EG3500, EM4000, EX4500, and more.
- Serial Number Verification Recommended — Honda updates electrical components at production serial breaks; confirm your unit's serial number against the fitment table to ensure this is the correct diode for your specific generator.
- Protects Charging Circuit Output — a functioning diode allows current to flow in one direction only, protecting downstream electrical components from reverse current; a failed diode can cause loss of DC output, battery charging failure, or damage to the generator's control circuit.
A DC diode is a one-way electrical valve in the generator's rectification circuit. In conventional Honda generators, the alternator produces alternating current (AC), and the diode allows only the correct half of that waveform to pass through to the DC output circuit — preventing reverse current from damaging sensitive electrical components or draining connected batteries. When this diode fails, symptoms typically include no DC charging output, erratic voltage behavior, or blown fuses in the DC circuit. Replacing a faulty diode with the correct Honda OEM part restores proper rectified current flow and returns the generator's DC output to normal operation.
Part Details
| Part Number | 31720-ZA8-013 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | DC Diode |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB2500, EM1600, EM1800, EM2200, EM2500 | 1015040-9999999 |
| Generator | EG1400, EG2200, EG2500 | 1023757-9999999 |
| Generator | EB12, EB3500, EB5000, EB11000, EG3500, EG5000, EM650, EM3500, EM3800, EM4000, EM5000, EM6500, ES6500, EX650, EX3300, EX4500, EX5500 | All |
| Inverter Generator | EB2200 | 1015040-9999999 |
| RV Generator | EV4010, EV6010, EVD4010 | 1007381-9999999 |
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.
