99502A13 Mercruiser Regulator | Genuine Used Part
99502A13 Mercruiser Regulator | Genuine Used Part
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🔧 Product Description
Genuine MerCruiser Water-Cooled Voltage Regulator - Part Number: 99502A13
A genuine Mercury MerCruiser water-cooled voltage regulator for 3.7L / 224 CID inline 4-cylinder sterndrive engines. This 40 amp regulator is used in the MerCruiser 470, 485, 488, 165, 170, 180, 190 and 3.7L charging-system family.
⚙️ Key Features
- Genuine Mercury MerCruiser voltage regulator
- Correct Mercury part number 99502A13
- Supersedes earlier 99502A9 regulator assembly
- Water-cooled 40 amp regulator for MerCruiser 3.7L / 224 CID 4-cylinder engines
- Used on sterndrive charging systems with the water-cooled regulator / rectifier configuration
🚤 Compatibility
Commonly used on
- MerCruiser 3.7L / 224 CID inline 4-cylinder sterndrive charging systems using the water-cooled regulator
Typically suits
- Engine models:
- MerCruiser 470 2BBL 4-cylinder sterndrive, 1976-1984
- MerCruiser 485 2BBL 4-cylinder sterndrive, 1980-1984
- MerCruiser 488 2BBL 4-cylinder sterndrive, 1980-1984
- MerCruiser 170 4-cylinder sterndrive, 1985-1986
- MerCruiser 190 4-cylinder sterndrive, 1985-1986
- MerCruiser 165 4-cylinder sterndrive, 1987
- MerCruiser 180 4-cylinder sterndrive, 1987
- MerCruiser 3.7L 4-cylinder sterndrive, 1988-1989
- MerCruiser 3.7LX 4-cylinder sterndrive, 1988-1989
- HP Range: approximately 165HP - 190HP in listed MerCruiser 3.7L applications
- Engine Type: MerCruiser 3.7L / 224 CID inline 4-cylinder petrol sterndrive
- Year Range: 1976 - 1989
- Charging System: 40 amp water-cooled regulator / rectifier configuration
🔌 Function
The voltage regulator rectifies and regulates alternator / stator charging output so the battery and electrical system receive controlled charging voltage while the engine is running.
⚠️ Common Signs of Failure
- Battery not charging
- Charging voltage too high or unstable
- Gauge voltage spikes at higher RPM
- Repeated battery boiling or electrical component damage
- No output after stator and wiring checks
- Water leak, corrosion or blockage at the regulator cooling connection
- Burn marks, heat damage or melted wiring at regulator terminals
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 99502A13 current Mercury / MerCruiser service reference
- 99502A12 earlier related regulator reference
- 99502A9 → Superseded by 99502A13
- 99502A8 / 99502A7 / 99502A4 earlier related 3.7L regulator references
OEM / Related Numbers
- 99502A13
- 99502A12
- 99502A9
- 99502A8
- 99502A7
- 99502A4
- 99502
- 77305A2
- 86255A2
- 86255A3
- Related regulator / rectifier conversion reference
Aftermarket / Verified Equivalents
- CDI Electronics: 194-9502
- Sierra: 18-99421
- CDI Electronics: 194-9502-4
- Aftermarket water-cooled regulator family: 99502A7 / 99502A9 / 99502A13
📦 Condition
- Genuine used part
- Removed from running engine where applicable
- In good working condition unless otherwise stated
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in the condition you received it for a refund or exchange. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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