Description

Mercury Quicksilver 821509T01 is a genuine OEM power trim relay for select Mercury and Mariner outboards. Current Mercury product pages identify 821509T01 specifically as a power trim relay, and dealer references list it as the active OEM replacement part rather than a general-purpose relay.

Key Features

• Genuine Mercury / Quicksilver OEM part number 821509T01.
• Officially described by Mercury as a power trim relay for select Mercury and Mariner outboards.
• Produced to Mercury Marine OEM specifications.
• Current dealer references show GTIN / UPC 745061334021.
• Current shipping-spec listings show approximate packaged size of 1.88 x 1.75 x 1.38 in and weight of 0.11 lb.

Engine Compatibility

The strongest supportable fitment for 821509T01 is various Mercury and Mariner outboards with compatible power trim systems. Mercury’s official listing keeps the application broad and directs buyers to the owner’s manual or service manual for exact application, so the safest fitment language is by exact outboard model and serial number rather than by a generic horsepower-only claim.

Serial Number Fitment Notice

Verify fitment by exact outboard serial number, trim system layout, and parts diagram before ordering. Mercury’s current owner-manual resources explain where to find the serial number on the outboard, and Mercury’s 821509T01 listing specifically says to use the owner’s manual or service manual for application confirmation.

When This Part Needs Replacement

This relay is typically replaced when the power trim system becomes intermittent, stops responding properly, or diagnosis points to a failed trim relay in the electrical circuit. That service guidance is a practical inference based on Mercury identifying 821509T01 as the power trim relay for the trim system application.

Installation Notes

Install 821509T01 only after confirming the correct Mercury or Mariner outboard application in the service literature. Because Mercury directs owners and technicians to the owner’s manual or service manual for exact application, it is best to match the relay to the correct trim-system diagram before replacement.

Alternate/Superseded Part Numbers

Current dealer references show 821509 and 853292 as earlier or superseded related OEM numbers for 821509T01.

Parts Desk Insight

This is a good example of why the SKU should lead the listing. The strongest current Mercury reference for 821509T01 points to a power trim relay for select Mercury and Mariner outboards, so matching by the exact part number and serial-specific trim application is the safer move than relying on a generic “relay” description alone.

Shipping: Ships same or next day for fast Canada wide shipping.