# 31630-ZY3-013 Honda Alternator | Genuine Used Part

## 🔧 Product Description

**Genuine Honda BF175 / BF200 / BF225 / BF250 12-Volt 90-Amp Alternator - Part Number: 31630-ZY3-013**

A genuine used Honda 90-amp alternator for selected V6 four-stroke outboards.

The internally regulated Denso-style alternator uses a six-groove serpentine pulley and supplies charging current for the engine, battery and onboard electrical systems. Honda diagrams show 31630-ZY3-013 on BF200 and BF225 engines, and aftermarket application catalogues extend the same alternator family to selected BF175 and BF250 models.

## ⚙️ Key Features

-   Genuine Honda 12-volt alternator
-   90-amp rated output
-   Correct Honda reference 31630-ZY3-013
-   Six-groove serpentine pulley
-   Extensive Denso, Sierra and electrical-industry cross references

## 🚤 Compatibility

### Commonly used on

-   Honda BF175 V6 outboards
-   Honda BF200 V6 outboards
-   Honda BF225 V6 outboards
-   Selected Honda BF250 V6 outboards using this alternator family

### Typically suits

-   Engine models:
-   Honda BF175A2, A3 and A6
-   Honda BF175AK-series
-   Honda BF200A2, A3 and A6
-   Honda BF200AK-series
-   Honda BF225A2, A3, A5 and A6
-   Honda BF225AK-series
-   Selected Honda BF250A engines where the fitted alternator cross-references to 31630-ZY3-013
-   HP Range: 175HP - 250HP
-   Engine Type: Honda V6 four-stroke EFI outboard
-   Year Range: Approximately 2002-2019, dependent on model

## 🔌 Function

The alternator generates electrical power while the engine is running, recharges the battery and supports ignition, EFI, trim and onboard electrical loads.

## ⚠️ Common Signs of Failure

-   Battery voltage does not rise with the engine running
-   Battery repeatedly becomes discharged
-   Charging warning or diagnostic code appears
-   Headlights or electronics fluctuate with rpm
-   Bearings become noisy
-   Pulley or belt runs out of alignment
-   Alternator overheats
-   Charging voltage is excessively high
-   Internal regulator or rectifier fails

## 🔄 Supersession & Cross Reference

### OEM Supersession Chain

-   31630-ZY3-013 → Replaces 31630-ZY3-003
-   31630-ZY3-003 earlier Honda alternator reference

### OEM / Related Numbers

-   Honda: 31630-ZY3-013
-   Honda: 31630-ZY3-003
-   Denso: 102211-2750
-   Arrowhead: AND0538
-   J & N Electrical: 400-52192
-   DB Electrical: 400-52192
-   Lester: 12757
-   Cross-reference: CJX75
-   Rotor assembly: 31631-ZY3-003

### Aftermarket / Verified Equivalents

-   Sierra: 18-6409
-   Recmar: REC31630-ZY3-003
-   DB Electrical: 400-52192
-   Arrowhead: AND0538
-   Denso: 102211-2750
-   Panimax / aftermarket reference: 1752
-   OEG and other marine replacements sold under Lester 12757

## 📦 Condition

-   Genuine used part
-   Removed from running engine where applicable
-   In good working condition unless otherwise stated

## Details

- **Price:** 1200.0 AUD
- **Vendor:** Sawley's Auto and Marine
- **Type:** Charging & Alternators
- **Tags:** Sawley’s AAM Used Parts – Alternators | Marine Charging Systems & Alternators

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 1200.00 AUD | In stock |

## Images

- 31630-ZY3-013 Honda Alternator | Genuine Used Part
- 31630-ZY3-013 Honda Alternator | Genuine Used Part - photo 2 of 8
- 31630-ZY3-013 Honda Alternator | Genuine Used Part - photo 3 of 8
- 31630-ZY3-013 Honda Alternator | Genuine Used Part - photo 4 of 8
- 31630-ZY3-013 Honda Alternator | Genuine Used Part - photo 5 of 8
- 31630-ZY3-013 Honda Alternator | Genuine Used Part - photo 6 of 8
- 31630-ZY3-013 Honda Alternator | Genuine Used Part - photo 7 of 8
- 31630-ZY3-013 Honda Alternator | Genuine Used Part - photo 8 of 8

---

> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/31630-zy3-013-honda-alternator-genuine-used-part)
> Updated: 2026-09-05