Mercury/Mariner Outboard Alternator Set, Ref 803703 | Genuine Tohatsu 3G2-06023-1

The Genuine Tohatsu Alternator Set (often listed as an alternator assy/charging or lighting coil) is fitted under the flywheel as part of the magneto assembly on select small outboards. It cross-references Mercury/Mariner OEM 803703 and is supplied under Tohatsu part number 3G2-06023-1.

If you’re replacing a failed charging/lighting coil, this OEM part is intended to restore correct electrical output when the correct match is confirmed. Fitment can vary by year and serial range—always match using your engine details and the reference numbers below.

• Part: Alternator Set / Alternator Assy (magneto charging/lighting coil)
• Tohatsu OEM ref: 3G2-06023-1
• Mercury/Mariner OEM ref: 803703
• Fits (Tohatsu/Nissan, per OEM parts listings): 2-stroke 9.9D2, 15D2, 18E2 (magneto assembly)
• Fits (Mercury/Mariner, where OEM 803703 is specified): 9.9HP (2 cyl, International) 0N059858 & Up; 15HP (2 cyl, International) 0N001590–0N055284 and 0N055285 & Up; 18HP (2 cyl, International) 0N001590–0N055284 and 0N055285 & Up
• Electrical note: Alternator coils typically output AC and require the correct rectifier/regulator (as applicable) for 12V DC battery charging.

Important: Confirm compatibility by engine model/serial and by matching the part number on your existing alternator/coil set before purchase.

Tohatsu disclaimer: Product images may be for reference only and may not show the exact part supplied. Do not rely on the image—match the exact part numbers and engine details before ordering.