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134-9021-3 is a replacement ignition trigger used on 75 HP 3cyl Mercury/Mariner 1989-96 models with Serial # OA996142 thru OG437999. Helps synchronize ignition timing with crankshaft position.
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Part #: 134-9021-3
Mercury75 HPTriggerWeight: 1 lb
4.0 / 5  (30 votes)
134-9021-3 is a replacement ignition trigger used on 75 HP 3cyl Mercury/Mariner 1989-96 models with Serial # OA996142 thru OG437999. Helps synchronize ignition timing with crankshaft position.
List Price: $153.99
Your Price: $139.95
Normally In Stock

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

Replaces OEM#'s

99021A3, 99021A5, 99021A9, 99021A13, 99021A15, 99021A16

Product Details

Designed for reliable ignition synchronization, this marine trigger helps coordinate spark timing events across the engine's RPM range.

Marine-grade insulation materials and sealed pickup circuitry help protect the trigger assembly from humidity, heat cycling, and electrical interference.

Features

  • Supports accurate CDI timing events
  • Designed for stable spark synchronization
  • Marine-grade sealed construction
  • Precision ignition timing signal generation

Common Symptoms of a Failing Trigger

  • Ignition timing drift after warm-up
  • Hard starting conditions
  • RPM instability under load
  • Engine misfire or hesitation

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.