BlueStars 862-1211-211-16 AM138068 Starter Solenoid Relay 12V - Compatible with Trombetta John Deere MTD Cub Cadet Lawn Tractor 725-04439 LA100 LA105 LA110 LA115 LA120 LA125 LA135 LA140 LA145 LA150

What It Is

This is a 12V starter solenoid relay that controls the high-current flow from the battery to the starter motor when you turn the key. It’s designed for lawn tractors and zero-turn mowers, primarily from John Deere, MTD, and Cub Cadet, with a focus on the LA100–LA150 series.

Fitment & Compatibility

Before buying, confirm your machine uses a 12V electrical system and that the solenoid has two large terminal posts (for battery and starter) plus two small spade terminals (for ignition signal). This BlueStars solenoid replaces OEM parts 725-04439, AM138068, and 862-1211-211-16. It fits Cub Cadet LA100–LA150 models (e.g., LA105, LA125, LA140) and many John Deere D100–D170 series. Measure the mounting hole spacing: it should be about 2.25 inches center-to-center. If your original solenoid has a different terminal layout (e.g., single small terminal), this won’t work. Check your mower’s model number on the frame or under the seat, not just the brand.

Key Things to Know

• Quality: This is an aftermarket part, not OEM. Most users report it works fine, but a small number note intermittent failure after a season. It’s a low-cost fix for a common failure point.
• Installation difficulty: Easy—typically a 15-minute job with a 10mm wrench or socket. Disconnect the battery first to avoid sparks. Label wires before removing the old solenoid.
• Common gotcha: The small terminals are unmarked. If your mower won’t crank after installation, swap the two small wires. On some models, polarity doesn’t matter, but on others it does.
• Durability: The plastic housing is less robust than OEM Trombetta units. Avoid over-tightening mounting bolts, which can crack the base.

Should You Buy It

If you have a compatible LA-series Cub Cadet or John Deere D-series with a failed solenoid and want a cheap, fast fix, this is a solid choice. It’s not for heavy commercial use—stick with OEM if you mow daily or need maximum reliability. For the average homeowner, the price and ease of installation make it a no-brainer.