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What is the Sierra 18-5743-1 Mercury Voltage Regulator used for?
The Sierra 18-5743-1 Mercury Voltage Regulator is designed for Mercury engines equipped with 16-amp to 40-amp charging systems. It is specified for Mercury engine applications from model year 1992 to present.
Which Mercury engines does the Sierra 18-5743-1 voltage regulator fit?
The Sierra 18-5743-1 is specified for Mercury engines with 16-amp to 40-amp charging systems from model years 1992 to present. Verify your engine's charging-system specifications and existing part number before ordering.
What charging system is the Sierra 18-5743-1 voltage regulator designed for?
This voltage regulator is designed for Mercury engines with charging systems rated from 16 amps through 40 amps. The supplied product information does not specify individual engine models, so confirm your charging-system rating before selecting this regulator.
What Mercury part numbers does the Sierra 18-5743-1 replace or interchange with?
The Sierra 18-5743-1 is listed as interchangeable with Mercury Marine part numbers 815279-3, 815279-5, 815279T, 8301792, 830179T, 854515, 854515T1, 856748, 883072T, and 8M0084173. It is also listed for Mercury Race Outboard and Mercury Sport Jet applications with specified part numbers.
Which aftermarket voltage regulators are interchangeable with the Sierra 18-5743-1?
The Sierra 18-5743-1 is listed as interchangeable with CDI 194-5279, Mallory 9-17101, and MES 1784M. Verify the original regulator part number and your Mercury engine's charging-system rating before using an interchangeable part number.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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