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889956 8M0033842 Mercury Alternator | Genuine Used Part

889956 8M0033842 Mercury Alternator | Genuine Used Part

$150.00 AUD
$150.00 AUD
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🔧 Product Description

Genuine Mercury 12V 50A OptiMax Alternator - Part Number: 8M0033842

A genuine used Mercury Marine Delco 5SI alternator for selected Mercury and Mariner OptiMax, DFI, EFI, Pro Max and Sport Jet engines.

The alternator uses an internally regulated, internal-fan design with a multi-groove serpentine pulley. It supplies up to 50 amps to recharge the starting battery and operate the engine-management and onboard electrical systems.

⚙️ Key Features

  • Genuine used Mercury Marine alternator
  • 12-volt, 50-amp charging output
  • Delco 5SI internally regulated design
  • SAE J1171 marine ignition protection
  • Used on selected 1.5L, 2.5L and 3.0L Mercury outboard and Sport Jet engines

🚤 Compatibility

Commonly used on

  • Mercury and Mariner OptiMax / DFI outboard charging systems
  • Mercury EFI, XB, Pro Max and Sport Jet applications using a Delco 5SI alternator

Typically suits

  • Engine models:
  • Mercury / Mariner 75HP 1.5L OptiMax - approximately 2005-2006
  • Mercury / Mariner 90HP 1.5L OptiMax - approximately 2004-2006
  • Mercury / Mariner 115HP 1.5L OptiMax - approximately 2004-2006 and selected 2009 applications
  • Mercury 200HP 3.0L OptiMax - approximately 2001-2004
  • Mercury 200HP 3.0L EFI - approximately 2005-2006
  • Mercury 225HP OptiMax applications using the 889956 alternator family
  • Mercury 250HP 3.0L XB - approximately 2002-2003
  • Mercury 250HP Sport Jet 2.5L - approximately 2002-2006
  • Mercury 250HP and 300HP Pro Max / Racing applications using alternator 881247A1 or 889956
  • Mercury OptiMax serial families using part numbers 875286A1, 881247A1, 889956 or 8M0033842
  • HP Range: 75HP - 300HP
  • Engine Type: Mercury / Mariner OptiMax, DFI, EFI, Sport Jet and Racing outboard
  • Year Range: Approximately 1998-2009

🔌 Function

The alternator maintains battery charge and provides electrical power to the engine control module, electric fuel pumps, injectors, instrumentation, trim system and boat accessories.

⚠️ Common Signs of Failure

  • Battery discharges while the engine is operating
  • Low charging-voltage alarm
  • Engine-management voltage faults
  • Electric fuel pump or trim system operates slowly
  • Alternator produces a whining, grinding or rumbling noise
  • Serpentine pulley or bearing develops excessive play
  • Charging voltage fluctuates as engine speed changes

🔄 Supersession & Cross Reference

OEM Supersession Chain

  • 8M6000803 → Supersedes 8M0064020
  • 8M0064020 → Supersedes 8M0033842
  • 8M0033842 → Supersedes 889956
  • 889956 → Supersedes 881247A1
  • 881247A1 → Supersedes 875286A1
  • 875286A1 earlier OEM alternator assembly

OEM / Related Numbers

  • 8M6000803
  • 8M0064020
  • 8M0033842
  • 889956
  • 881247
  • 881247A1
  • 875286
  • 875286A1
  • 875286T
  • 828506
  • Delco Remy: 19020704
  • Delco Remy: 19020707
  • Prestolite: 20115011TBA
  • Lester: 8471

Aftermarket / Verified Equivalents

  • ARCO Marine: 20850
  • Sierra: 18-6455
  • DB Electrical: 400-12303
  • API Marine: 20117-AM
  • OEG Parts: ADR0318
  • WAI: 8471N
  • ComponentsPlus: 400-12155

📦 Condition

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

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

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?

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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