Baldwin Starter Solenoid Relay 12V 3-Pole Part 1KB7721
A 12-volt, 3-pole starter solenoid relay replacing multiple OEM part numbers for Honda ATV and SXS models from 1990 through 2021
- Compatibility/FitmentOut-Opening, Narrow Stile, Store Front Doors
- Number of Poles3
- Line Voltage12 volts
- Direct OEM replacement covering multiple part numbers
- 12-volt three-pole design matches original electrical specs
- Silver-alloy contacts resist oxidation for longer service life
- Copper coil delivers reliable ignition in high temperatures
- Fits Honda ATV and SXS models from 1990 through 2021
Baldwin 12 V 3-Pole Starter Solenoid Relay
The Baldwin 1KB7721 is a new 12 volt three-pole solenoid relay built for Honda ATV and side-by-side models including Rancher 350, Rancher 420, Foreman 450, Foreman 500, Foreman 520, Rubicon 500, Rubicon 520, Pioneer 500, Pioneer 700 and Pioneer 1000 across model years from 1990 through 2021. It replaces a long list of OEM part numbers such as 35850-HF1-670, 35850-HM3-A60, 35850-HN0-670, 35850-HN2-A01 and 35850-HP5-600.
Check fitment and wiring before ordering
Verify that the original unit on your machine is a three-pole 12 volt relay with the same mounting style and connector layout as the OEM references listed. Confirm the vehicle year and model match the compatibility range shown for TRX and SXS series machines. Ensure the battery and starter circuit are in good condition so the new relay operates within its rated voltage.
Replaces worn or failed OEM solenoids
This relay upgrades from a faulty original that causes no-crank or intermittent starting on the listed Honda four-wheelers and SXS models. The copper coil and silver-alloy contacts are designed for longer service life than aged factory units. The jump is worth it when the starter clicks but the engine does not turn, or when voltage drop across the old relay prevents reliable ignition. Not for buyers who need a different pole count or voltage rating.
Highlights
- Direct OEM replacement covering multiple part numbers
- 12-volt three-pole design matches original electrical specs
- Silver-alloy contacts resist oxidation for longer service life
- Copper coil delivers reliable ignition in high temperatures
- Fits Honda ATV and SXS models from 1990 through 2021
Specifications
| Compatibility/Fitment | Out-Opening, Narrow Stile, Store Front Doors |
|---|---|
| Number of Poles | 3 |
| Line Voltage | 12 volts |
| Brand | Baldwin |
| Part Number | 1KB7721 |
Questions about this item
What comes with the Baldwin 1KB7721 starter solenoid and do I need to buy any mounting hardware separately?
The box contains the 12 V three-pole relay only; no brackets, wiring pigtails or mounting bolts are included, so reuse the original hardware from the Honda ATV or order the correct OEM mounting kit for your model.
Which version of this solenoid fits my 2012 Honda Foreman 500 TRX500FM?
Part 1KB7721 directly replaces OEM numbers 35850-HN7-003 and 35850-HN2-A01 used on the 2012 Foreman 500, so this single version is the correct choice.
What does the 12 V 3-pole rating mean when the relay is installed on my TRX420 Rancher?
It switches the starter motor circuit at the ATV's 12 V system voltage through three contacts — battery feed, starter output and a third terminal for accessory or control wiring — matching the factory wiring harness.
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