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474-9550 is an ignition boat harness built for 40 HP 2cyl electric start Mercury/Mariner 1970-81 models with Serial # 2874704 thru 5823917. Helps restore reliable operation on compatible marine ignition systems.
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Part #: 474-9550
Mercury40 HPBoat harnessWeight: 3 lb
4.0 / 5  (18 votes)
474-9550 is an ignition boat harness built for 40 HP 2cyl electric start Mercury/Mariner 1970-81 models with Serial # 2874704 thru 5823917. Helps restore reliable operation on compatible marine ignition systems.

Notes:

20' harness length and includes 6' battery lead.

List Price: $362.69
Your Price: $330.05
Normally In Stock

In Stock items ship same day if ordered before 3PM CST (excluding weekends and holidays)

Replaces OEM#'s

84-822253T20

Product Details

Built for reliable marine electrical-system operation, this boat harness supports dependable signal transfer between the engine harness, control box, ignition switch, and gauges.

Matched OEM-style connectors and color-coded marine-grade wiring help simplify installation and support accurate electrical-system routing during replacement.

Features

  • Supports remote control and gauge integration
  • Matched OEM-style engine harness connectors
  • Color-coded marine-grade wiring
  • Helps simplify installation and wiring identification

Common Symptoms of a Failing Boat Harness

  • Electrical-system connection failures
  • Unstable engine-to-control-box electrical connectivity
  • Corroded or damaged harness connectors
  • Ignition-switch or accessory wiring issues

Need Fitment Help?

Tell us your brand, horsepower, and part number. We can help verify fitment before you order.

Support PDF files appear on this page when available.