Sierra 223-5800 Solenoid, Replaces Westerbeke 24639, for Select Westerbeke Generators

The Sierra 223-5800 is a replacement cranking solenoid built for select Westerbeke marine generators. It serves as the electrical switch that engages the starter circuit when the generator start signal is given, handling the high-current draw of the starter motor while being triggered by a low-current control signal from the start switch or panel. The unit measures 3.25 x 3.25 x 3.25 inches and is rated for 10 amps of cranking current. It is built with marine grade materials for reliability in the onboard electrical environment where corrosion resistance and consistent contact performance matter. This solenoid directly replaces Westerbeke part number 24639 and is designed to fit a broad range of Westerbeke BCD, BTD, BTDA, BTDB, BTDC, WMD, WTA, WTF, BED, and BEDA generator models across both 50 Hz and 60 Hz configurations, as detailed in the Fitment section below. It is a straightforward drop-in replacement for a failed or worn factory solenoid, restoring reliable generator starting without modifying existing wiring. Included in the box is one solenoid unit.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 223-5800
• Item Type: Solenoid
• Amperage: 10 Amps
• Phase Type: Cranking
• Item Dimensions (L x W x H): 3.25 x 3.25 x 3.25 inches
• Weight: 0.8 pounds
• UPC: 808282291419
• Included Components: Solenoid
• Application: Westerbeke Generator Parts

Fitment

• Westerbeke 10.0 BTD (60Hz) / 7.5 BTD (50Hz)
• Westerbeke 10.0 BTDA (60Hz) / 7.5 BTDA (50Hz)
• Westerbeke 11.0 BTD (60Hz) / 8.3 BTD (50Hz)
• Westerbeke 11.0 WMD (60Hz) / 8.3 WMD (50Hz)
• Westerbeke 12.5 BTD (60Hz) / 9.4 BTD (50Hz)
• Westerbeke 12.5 BTDA (60Hz) / 9.4 BTDA (50Hz)
• Westerbeke 12.5 BTDB (60Hz) / 9.4 BTDB (50Hz)
• Westerbeke 12.5 WMD (60Hz) / 9.4 WMD (50Hz)
• Westerbeke 15.0 BTD (60Hz) / 12.0 BTD (50Hz)
• Westerbeke 15.0 BTDA (60Hz) / 12.0 BTDA (50Hz)
• Westerbeke 15.0 BTDB (60Hz) / 12.0 BTDB (50Hz)
• Westerbeke 15.0 BTDC (60Hz) / 12.0 BTDC (50Hz)
• Westerbeke 15.0 WTA (60Hz) / 12.0 WTA (50Hz)
• Westerbeke 20.0 BED (60Hz) / 16.0 BED (50Hz)
• Westerbeke 20.0 BEDA (60Hz) / 16.0 BEDA (50Hz)
• Westerbeke 20.0 WTA (60Hz) / 16.0 WTA (50Hz)
• Westerbeke 25.0 BED (60Hz) / 20.0 BED (50Hz)
• Westerbeke 25.0 WTA (60Hz) / 20.0 WTA (50Hz)
• Westerbeke 3.0 WMD (60Hz) / 2.4 WMD (50Hz)
• Westerbeke 32.0 BED (60Hz) / 25.0 BED (50Hz)
• Westerbeke 32.0 BEDA (60Hz) / 25.0 BEDA (50Hz)
• Westerbeke 32.0 BEDB (60Hz) / 25.0 BEDB (50Hz)
• Westerbeke 32.0 WTF (60Hz) / 25.0 WTF (50Hz)
• Westerbeke 4.0 BCD (60Hz)
• Westerbeke 4.4 BCD (60Hz)
• Westerbeke 4.4 WMD (60Hz) / 3.3 WMD (50Hz)
• Westerbeke 5.0 BCD/BCDA/BCDB (60Hz) / 4.0 BCD/BCDA/BCDB (50Hz)
• Westerbeke 6.0 BCD (60Hz) / 4.5 BCD (50Hz)
• Westerbeke 7.6 BTD (60Hz) / 5.7 BTD (50Hz)
• Westerbeke 7.7 WMD (60Hz) / 5.8 WMD (50Hz)
• Westerbeke 8.0 BTD (60Hz) / 6.0 BTD (50Hz)
• Westerbeke 8.0 BTDA (60Hz) / 6.0 BTDA (50Hz)
• Westerbeke 8.0 WMD (60Hz) / 6.0 WMD (50Hz)

Replaces (OEM)

• Westerbeke 24639

Frequently Asked Questions

What does the Sierra 223-5800 solenoid do? It is the cranking solenoid for select Westerbeke marine generators, switching high-current power to the starter motor when the start circuit is triggered, and it is rated for 10 amps.

What OEM part does the Sierra 223-5800 replace? This solenoid directly replaces Westerbeke part number 24639.

Which Westerbeke generator models does this solenoid fit? The Sierra 223-5800 fits a wide range of Westerbeke BCD, BTD, BTDA, BTDB, BTDC, WMD, WTA, WTF, BED, and BEDA generator models in both 50 Hz and 60 Hz versions, listed in full in the Fitment section.

What are the dimensions of this solenoid? The Sierra 223-5800 measures 3.25 x 3.25 x 3.25 inches.

How much does the solenoid weigh? It weighs 0.8 pounds.

Is this a genuine Westerbeke part or an aftermarket replacement? The 223-5800 is a Sierra-branded aftermarket replacement built to serve as a direct equivalent to Westerbeke part number 24639, not an original Westerbeke-branded component.

What amperage rating does this solenoid have? 10 amps, sized for the cranking current draw of the compatible Westerbeke generator starter circuits.

What is included when I order this part? One Sierra 223-5800 solenoid unit is included.

Will this solenoid work on my 8.0 BTD Westerbeke generator? Yes, the Sierra 223-5800 is listed to fit the Westerbeke 8.0 BTD (60Hz) / 6.0 BTD (50Hz) generator, along with the other models listed in the Fitment section.

Is the Sierra 223-5800 built for marine use? Yes, it is built with marine grade materials intended for reliability in the onboard electrical environment of a boat generator installation.

What is the material or construction of this solenoid intended for? The Sierra 223-5800 uses marine grade construction suited to withstand the onboard marine environment, though a specific housing material is not specified.

How do I know if I need this solenoid part number instead of a different Sierra solenoid? Confirm your Westerbeke generator model against the Fitment list for the Sierra 223-5800, or match it against Westerbeke part number 24639 which this part directly replaces.