Tutor Auto Ignition Switch for Mercury/Mariner Outboards — 3-Position 6-Wire, Includes 2 Keys (87-17009A5/A2 Fit)

Tutor Auto replacement ignition switch for Mercury/Mariner outboards is a three-position, six-wire key switch with two keys designed to restore reliable starting and push-choke control.

If your outboard motor requires more force to turn the key, fails to start, or shows signs of corrosion around the control box, replacing the ignition switch is often the quickest way to get back on the water. This Tutor Auto unit is built to match the wiring and mechanical layout of common Mercury/Mariner control boxes and replaces OE numbers such as 87-17009A5 and 87-17009A2. It includes two keys, color-matched wires for straightforward installation, and materials chosen to resist corrosion and wear in marine environments.

How does this ignition switch restore starting performance?

Worn or oxidized switch contacts and housings can interrupt the electrical path required for starting. This replacement switch uses brass contacts and a non-conductive polyester housing to maintain consistent conductivity while minimizing short risks, helping the starter and push-choke function correctly.

• Three positions: Off, Ignition, Start for expected control behavior
• Six-wire harness matches factory color coding for straightforward wiring
• Brass contacts for improved electrical reliability
• Non-conductive housing to reduce short-circuit risk

Will this unit fit my Mercury or Mariner outboard control box?

It is designed as a direct-fit replacement for many Mercury/Mariner control boxes that accept part numbers 87-17009A5 and 87-17009A2, plus related OEM references. Always compare the part number and wire configuration on your existing switch to ensure compatibility before purchase.

• Replaces Mercury OE: 87-17009A5, 87-17009A2
• Also compatible with MP51090, MP41070-2, MP41070-1 style setups
• Six-wire plug follows factory color code for matching
• Not an OEM Mercury part but built to meet OEM standards

How difficult is installation and what tools are needed?

Installation is straightforward for anyone comfortable with basic marine electrical work. The switch wiring uses factory color codes so you can match each conductor directly; typical installation requires simple hand tools and a few mounting steps.

• Match colored wires to the existing harness—no guessing required
• Basic tools: screwdriver, pliers, and possibly a multimeter for verification
• Standard panel hole and mounting pattern for direct replacement
• Includes two keys so you can get underway immediately after install

What materials and features improve longevity in marine conditions?

The Tutor Auto switch pairs corrosion-resistant metals with a durable polyester housing to better withstand salt spray, humidity, and vibration. These choices reduce oxidation at electrical contacts and lower the chance of abrasion-related failure.

• Polished brass contacts for conductivity and reduced corrosion
• Polyester, non-conductive housing to prevent shorts and wear
• Sealed construction elements to limit moisture intrusion
• Includes two cut keys for backup and convenience

Who is this for? Boaters and marine technicians who need a reliable, cost-effective replacement ignition switch for Mercury or Mariner outboards will find this Tutor Auto unit practical. It suits owners replacing failed or corroded switches in control boxes, DIY mechanics who prefer a color-matched, plug-and-play wiring approach, and service shops that stock direct-fit aftermarket replacements. Confirm your existing part number and wire layout to ensure compatibility before ordering; Tutor Auto provides a one-year warranty and customer support if you need assistance.