Mercury – Quicksilver 821509T01 Power Trim Relay | Mercury & Mariner Outboards | 821509T01

Overview

If your outboard’s trim system isn’t responding or only works intermittently, the relay is usually to blame. The Quicksilver 821509T01 Power Trim Relay is the genuine OEM replacement designed for Mercury and Mariner outboards. It restores smooth, reliable power to your trim motor — so you can raise or lower your engine without hesitation.

Built to Mercury’s factory standards, this relay handles the electrical demands of marine use. It’s sealed to resist water, salt, and vibration, keeping your trim system dependable season after season.

Key Features

• Purpose: Restores full trim and tilt function by replacing a faulty relay.
• Fitment: For use with various Mercury and Mariner outboards (check your manual for compatibility).
• Construction: Marine-grade materials designed to resist corrosion, heat, and vibration.
• Performance: Meets Mercury Marine OEM specifications for reliability and consistent electrical flow.
• Ease of Install: Direct-fit replacement installs easily with basic tools.

Engine & Boat Compatibility

• Fits a range of Mercury and Mariner outboards
• Common on fishing boats, runabouts, pontoons, and center consoles

Performance & Practical Benefits

The 821509T01 Power Trim Relay provides the consistent voltage your trim motor needs to move smoothly. When a relay wears out, trim operation can become sluggish or stop entirely — this replacement restores instant response.

The relay’s sealed housing protects the internal contacts from corrosion, even in saltwater. It’s a quick, simple fix that brings your trim system back to factory reliability, giving you better control over engine angle and performance.

Why Buy OEM

Mercury’s OEM electrical parts are designed specifically for the marine environment — constant vibration, moisture, and heavy current loads. Aftermarket relays might look similar but often aren’t fully sealed or use cheaper components that fail early.

A genuine Quicksilver relay gives you exact fit, tested reliability, and the long-lasting performance Mercury owners depend on.

FAQ

Q1: What engines use the Quicksilver 821509T01 relay?
A: It’s made for various Mercury and Mariner outboards — check your owner’s manual for exact models.

Q2: What does the relay do?
A: It directs electrical power to your trim and tilt motor, allowing you to raise and lower your engine.

Q3: Can I install it myself?
A: Yes. It’s a direct replacement that installs easily with standard tools.

Q4: Is it sealed against corrosion?
A: Absolutely. It’s built with a sealed housing to resist water and salt exposure.

Q5: Why OEM instead of aftermarket?
A: OEM relays meet Mercury’s standards for durability and performance, ensuring long-term reliability.