Sierra Voltage Regulator 18-5732-1, Replaces 893640T01, Fits Mercury/Mariner 30/40/50/60 EFI 4-Stroke Outboards

This Sierra voltage regulator, part number 18-5732-1, is an electrical system component built for Mercury/Mariner 30/40/50/60 EFI 4-Stroke outboard engines. It regulates the charging voltage produced by the outboard's stator to keep the battery charging system operating within a safe range, protecting onboard electronics and the battery from damage caused by overcharging.

The regulator includes a built-in capacitor that provides high voltage spike protection, helping guard connected electrical components against transient voltage surges during engine operation. It is a compact, direct-fit unit designed to mount in place of the original Mercury/Mariner regulator, and it cross-references directly to OEM part number 893640T01, so it installs using the existing mounting points and wiring connections on applicable EFI 4-Stroke outboards.

Sierra manufactures this regulator to serve as a reliable replacement for outboard owners and marine technicians who need to restore proper charging system function on Mercury/Mariner 30, 40, 50, and 60 HP EFI 4-Stroke models.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5732-1
• Product Type: Voltage Regulator
• Weight: 0.64 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• UPC: 808282398286
• Feature: Built-in capacitor for high voltage spike protection
• Fits: Mercury/Mariner 30/40/50/60 EFI 4-Stroke

Fitment

• Mercury/Mariner 30/40/50/60 EFI 4-Stroke outboards

Replaces (OEM)

• 893640T01

Frequently Asked Questions

What does the Sierra 18-5732-1 voltage regulator fit? The Sierra 18-5732-1 voltage regulator fits Mercury/Mariner 30/40/50/60 EFI 4-Stroke outboard engines.

Is the Sierra 18-5732-1 a direct replacement for the Mercury 893640T01 regulator? Yes, Sierra part 18-5732-1 replaces Mercury/Mariner OEM voltage regulator 893640T01 and installs in the same location using the original mounting and wiring.

Does this voltage regulator include surge protection? Yes, the Sierra 18-5732-1 has a built-in capacitor that provides high voltage spike protection for the outboard's electrical system.

What are the dimensions of the Sierra 18-5732-1 voltage regulator? It measures 0.39 x 0.39 x 0.39 inches.

How much does the Sierra 18-5732-1 voltage regulator weigh? This voltage regulator weighs 0.64 pounds.

What is the function of a voltage regulator on an outboard motor? A voltage regulator like the Sierra 18-5732-1 controls the charging voltage sent from the stator to the battery, preventing overcharging and protecting the battery and onboard electronics.

Will the 18-5732-1 work on any Mercury outboard? No, the Sierra 18-5732-1 is designed specifically for Mercury/Mariner 30/40/50/60 EFI 4-Stroke outboard models, not the full Mercury outboard lineup.

Is Sierra 18-5732-1 an OEM or aftermarket part? The 18-5732-1 is a Sierra-manufactured aftermarket voltage regulator engineered to replace Mercury/Mariner OEM part 893640T01.

Does the Sierra 18-5732-1 come with mounting hardware? The dossier for the Sierra 18-5732-1 voltage regulator does not list included mounting hardware; it is sold as the regulator unit.

What OEM part number does the Sierra 18-5732-1 cross-reference to? It cross-references to Mercury/Mariner OEM part number 893640T01.