Husqvarna Starter Solenoid for Riding & Zero Turn Mowers Fits Z, CZ, EZ, RZ, MZ, PZ, WH, iZ, WHF, ZTH, ZTHKW / 539101714

What It Is

This Husqvarna 539101714 starter solenoid is a replacement relay that connects the battery to the starter motor on riding mowers and zero-turn mowers. It’s designed for models where the ignition switch isn’t directly wired to the starter, common on larger residential and commercial mowers with electric start.

Fitment & Compatibility

• Exact OEM part number: 539101714. Only buy this if your mower calls for that number.
• Fits Husqvarna Z, CZ, EZ, RZ, MZ, PZ, WH, iZ, WHF, ZTH, ZTHKW series – check your model tag under the seat or on the frame.
• Also fits some Poulan Pro, Jonsered, and McCulloch models that use the same solenoid – verify your old part number matches.
• Physical size: 2.5" L x 1.5" W x 1.75" H, two small spade terminals and two large 5/16" stud terminals. Measure your mounting bracket spacing (2.75" center-to-center on the studs) before ordering.
• Works with 12V systems only. Not for 6V or 24V mowers.
• Not for push mowers – this is for riding/zero-turn models with a battery and starter motor.

Key Things to Know

• Quality: OEM Husqvarna part, so it’s built to factory specs. Aftermarket copies often fail faster due to cheaper internal contacts.
• Installation difficulty: Easy (30 minutes). Disconnect battery negative first, then swap the two large cables and two small wires. Label wires with tape before removal to avoid confusion.
• Common gotcha: If your mower clicks but doesn’t crank, test the solenoid with a multimeter (12V at the small terminal when key is turned). A weak battery can mimic a bad solenoid.
• Return policy: This is an electrical part – test immediately. Many sellers won’t accept returns once installed.

Should You Buy It

If your Husqvarna riding or zero-turn mower clicks or won’t start and you’ve confirmed the battery is good, this OEM solenoid is a reliable, low-cost fix. It’s the right choice for DIY owners who want a direct fit without guessing – just double-check your model number and terminal spacing before ordering.