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474-9550 is a replacement ignition boat harness used on 20 HP Mercury/Mariner 1973-81 models with Serial # 3537531 thru 5837436. Used to replace worn or failed ignition components in outboard service.
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Part #: 474-9550
Mercury20 HPBoat harnessWeight: 3 lb
4.0 / 5  (25 votes)
474-9550 is a replacement ignition boat harness used on 20 HP Mercury/Mariner 1973-81 models with Serial # 3537531 thru 5837436. Used to replace worn or failed ignition components in outboard service.

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

  • Helps simplify installation and wiring identification
  • Designed for dependable marine electrical-system connectivity
  • Color-coded marine-grade wiring
  • Marine-grade insulated conductors

Common Symptoms of a Failing Boat Harness

  • Ignition-switch or accessory wiring issues
  • Intermittent gauge or control-box operation
  • Electrical-system connection failures
  • Voltage drop caused by deteriorated conductors

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.