784-1221-210 117-1197 Starter Solenoid 12V 4 Terminal Compatible with Exmark Lawn Boy Toro Timecutter SS5000 Z4200 SS4225 SS4235 Zero Turn Lawn Mower Parts 104-3189 1-212655 28-4210 47-1910

What It Is

This is a 12V, 4-terminal starter solenoid that engages the starter motor when you turn the key on zero-turn mowers. It’s designed for Toro, Exmark, and Lawn Boy commercial and residential models, including TimeCutter and Z-series units.

Fitment & Compatibility

Before buying, verify your mower’s model and serial number. This solenoid replaces OEM parts 104-3189, 1-212655, 28-4210, and 47-1910. It fits Toro TimeCutter SS5000, Z4200, SS4225, SS4235, and Exmark Z4200/SS series. Also compatible with many Lawn Boy and Toro zero-turn mowers using a 4-terminal, 12V solenoid. Check terminal layout – this has two small terminals (trigger) and two large terminals (battery/starter). Measure mounting hole spacing (typically 2.5″ center-to-center) and ensure your existing bracket matches. Not for push mowers or older 6V systems.

Key Things to Know

• Quality is solid for the price – aftermarket, but consistent with 4.8-star reviews. No known failure pattern.
• Installation is straightforward – disconnect battery, remove two small wires (label them), then two large cables. Use a wrench, no special tools. Takes 10 minutes.
• Common gotcha – if the mower clicks but won’t crank, the solenoid is often the culprit, but also check battery voltage and cable connections first.
• Terminal orientation matters – some solenoids have terminals on opposite sides. This model matches OEM layout, but double-check before fully tightening.

Should You Buy It

If your zero-turn mower clicks or doesn’t start and you’ve confirmed battery and cables are good, this is a cheap, easy fix. It’s right for DIY owners of Toro/Exmark/Lawn Boy models listed above who want a reliable aftermarket replacement without paying OEM prices. Skip it if you need a 3-terminal or 6V solenoid, or if your mower isn’t in the compatibility list.