Starter Solenoid for John Deere AM138068 Cub Cadet 725-04439 MTD Troy-Bilt Trombetta 862-1211-211-16 Riding Lawn Mower Tractor

What It Is

This starter solenoid is a small electrical relay that sends battery power to the starter motor when you turn the key, designed for riding lawn mowers and tractors. It’s commonly used on John Deere, Cub Cadet, MTD, and Troy-Bilt models with Briggs & Stratton or Kohler engines.

Fitment & Compatibility

Before buying, verify these three things:

• OEM cross-references: Fits John Deere AM138068, Cub Cadet 725-04439, MTD 925-04439, and Trombetta 862-1211-211-16. Also replaces many 12V 3-post solenoids.
• Physical check: Measure your old solenoid—this one is roughly 2.5" x 1.5" x 1.5". Ensure the mounting bracket holes (about 3.5" center-to-center) and terminal post spacing match.
• Wiring: It has three terminals (two large battery/starter posts, one small trigger wire post). Confirm your mower uses a standard spade or ring connector setup—no diode or resistor required.

Key Things to Know

• Quality: Aftermarket part, but 4.6 stars from 1,527 reviews suggests good reliability. Not OEM, but far cheaper than dealer replacements.
• Installation: Simple swap—disconnect battery, remove two wires from old solenoid, unbolt it, replace, and reconnect. Takes 15 minutes with basic tools (wrench, screwdriver).
• Gotcha: The small trigger terminal is often labeled “S” or “I”—connect your start wire to the post that matches your old solenoid’s trigger. Swapping large cables won’t hurt, but wrong trigger connection can cause no-start.
• Testing: If your mower clicks but won’t crank, this solenoid is a likely culprit. Check battery voltage first (12.6V+) to avoid replacing a good part.

Should You Buy It

Buy this if your riding mower’s starter clicks but doesn’t engage, and you’ve confirmed the battery is charged and cables are clean. It’s a budget-friendly, high-rated replacement for common John Deere, Cub Cadet, and MTD models—perfect for DIYers wanting a quick fix without dealer markup.