The Sierra 18-5852 shrouded power trim relay replaces Mercury 821509T01 for applicable Mercury / Mariner 4-Stroke outboards. It switches the trim electrical circuit and fits the published 45HP and 50HP serial ranges below.
For: 4-Stroke Mercury/Mariner Outboards
Fits: Four-Stroke 45 HP Serial Range 0G231123 to 0G472132 and Four-Stroke 50 HP Serial Range 0G231123 to 0T178499
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-5852?
Sierra 18-5852 is an aftermarket relay for Mercury / Mariner Outboard applications.
Which part numbers cross-reference Sierra 18-5852?
This listing cross-references Chrysler / Force 821509, Mallory 9-15212, Mercury 821509 and Mercury 821509T01. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-5852 fits my Mercury / Mariner Outboard application?
Contact us with your engine model and serial number and we'll help check suitability.
Australian Dollars
