Harley-Davidson X440 / X440 OBDII / X440T Starter Solenoid Switch Assembly OEM | HDH35850-RAA-001

Replace a weak, faulty, or non-working starter solenoid with this genuine OEM starter solenoid switch assembly for Harley-Davidson X440 series motorcycles. Part number HDH35850-RAA-001 is the correct OEM replacement for riders searching for the starter solenoid, self start relay, starter relay, or starter switch assembly on the listed X440 models.

This part plays an important role in the electric starting system. When the starter solenoid begins to fail, riders may notice symptoms like a click without cranking, intermittent starting, weak starter engagement, or complete no-crank behaviour even when the battery and starter button seem fine. Replacing the correct OEM solenoid helps restore more reliable starter circuit operation.

This page is written in customer-friendly language so buyers can find the part using the terms they naturally search. Instead of relying only on the factory description, it includes common search terms like starter solenoid, starter relay, and self start relay.

Confirmed fitment: Harley-Davidson X440, X440 OBDII, and X440T. This SKU is not confirmed here for X440X or Hero Mavrick 440, so please do not assume it is shared across all 440-family motorcycles.

This listing is for one starter solenoid switch assembly only. It is not the starter motor, not the battery, not the starter button, and not a full starting system kit. Please match the old part number and exact requirement before ordering.

Key Features

• Genuine OEM starter solenoid switch assembly
• Part number: HDH35850-RAA-001
• Factory description: SW ASSY START SOLENOID
• Buyer language: starter solenoid, self start relay, starter relay, starter switch assembly
• Confirmed for Harley-Davidson X440, X440 OBDII, and X440T
• Useful for click-no-crank, intermittent start, or weak starter engagement symptoms
• Helps restore reliable electric start circuit operation
• Important distinction from starter motor and starter button parts
• OEM-style replacement for the listed applications

Compatibility

Variants

None.

What's in the Box

• 1 x HDH35850-RAA-001 – Starter Solenoid Switch Assembly

Installation & Maintenance Notes

• Please match the old part number before ordering.
• This is the starter solenoid / relay unit, not the starter motor.
• Inspect battery condition, cable terminals, fuse condition, and starting circuit connections during diagnosis.
• If the bike has repeated no-crank issues, test the battery and charging condition before replacing electrical parts blindly.
• After installation, check terminal tightness and starter function before regular use.

Before You Order

Important: This listing is for one starter solenoid switch assembly. It is not the starter motor, not the starter switch button, and not a complete starting system kit.

Please do not assume all X440-family motorcycles use the same electrical parts. Match your bike model and old part number before ordering.

Why Buy From Under The Hood

• Buyer-friendly naming built around real search terms
• Clear distinction between solenoid, relay, starter motor, and switch parts
• Fitment kept conservative to reduce costly wrong orders
• Useful for customers solving starting issues with the correct OEM part

FAQs

1. What is HDH35850-RAA-001?
It is the OEM starter solenoid switch assembly for the listed Harley-Davidson X440 applications.

2. Which bikes is this confirmed for?
It is confirmed for Harley-Davidson X440, X440 OBDII, and X440T.

3. Is this the starter motor?
No. This listing is for the starter solenoid / relay assembly, not the starter motor.

4. Is this the same as a self start relay?
Yes. Buyers commonly search this part as a self start relay, starter relay, or starter solenoid.

5. Will it fit X440X or Hero Mavrick 440?
Those applications are not confirmed here for this SKU. Please verify by VIN / EPC / old part match before ordering.

6. When should a starter solenoid be replaced?
Replace it when it is faulty and causing click-no-crank behaviour, intermittent starting, or failed starter engagement after proper diagnosis.

7. What should be checked before ordering?
Confirm the bike model, old part number, and diagnose the battery and start circuit properly before purchase.