4 Best Power Smart Lawn Mower Won’t Start Parts and Replacements (2026)

By Carter Bishop

Updated November 2026

When a power smart lawn mower won’t start, the most common culprit on many models is the starter solenoid, the electrical relay that sends battery current to the starter motor when you turn the key or press the start button. Replacing a worn solenoid is often a fast, inexpensive repair compared with rebuilding the starter or replacing the battery. This list compares four solenoid replacements on the selection criteria that matter most: fit to the common Poulan, Craftsman and Husqvarna-style electrical systems, direct bolt-on installation, contact material and owner feedback patterns. Before buying anything, confirm the part number printed on your old solenoid matches the listings below.

Our Top Picks

Quick Comparison

146154 145673 Starter Solenoid 12V for Craftsman LT1000 Poulan 532145673 Husqvarna 532146154 AYP 109081X Lawn Mower

146154 145673 Starter Solenoid 12V for Craftsman LT1000 Poulan 532145673 Husqvarna 532146154 AYP 109081X Lawn Mower

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Best for: Owners who need a solenoid that cross-references several Poulan, Craftsman and Husqvarna part numbers.

This is a good fit if your mower’s original solenoid is stamped with one of the numbers in the listing title, or if you are unsure which OEM number applies. Because the part is sold against several equivalent numbers, it is easier to confirm compatibility before ordering.

Key specs

• 12V starter solenoid
• Listed cross-references include 145673, 146154, 532145673 and 532146154
• Also listed for AYP 109081X lawn mowers

Pros

• Multiple OEM part numbers listed, which simplifies compatibility checks
• Designed as a replacement for a common 12V starting circuit
• Covers several brands that share similar electrical layouts

Cons

• Cross-reference lists do not guarantee fit on every model year, so check your old part first
• Installation may require minor wiring attention on some units

Bottom line: A strong first choice for owners who want the widest part-number coverage and are comparing an old solenoid’s markings against a list.

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HipaLawn Mower, fits Poulan, Craftsman, replace 178861, 892-1221-210, 894-1221-210, 532145673, direct bolt-on 12V 4-Post Starter Solenoid 145673 146154

HipaLawn Mower, fits Poulan, Craftsman, replace 178861, 892-1221-210, 894-1221-210, 532145673, direct bolt-on, reliable starting 12V 4-Post Starter Solenoid 145673 146154 for Husqvrana 532146154

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Best for: Owners who want a direct bolt-on replacement with a long list of cross-referenced numbers.

This listing is aimed at owners replacing a four-post solenoid who want to match against several older numbers, including 178861 and 892-1221-210 style references. It suits anyone who has already removed the old unit and wants to compare terminal layout before installing.

Key specs

• 12V four-post starter solenoid
• Listed to replace 178861, 892-1221-210, 894-1221-210 and 532145673
• Also referenced for 145673 and 146154 applications

Pros

• Describes a direct bolt-on design
• Broad cross-reference list across older and newer part numbers
• Four-post layout matches many older Poulan and Craftsman systems

Cons

• Long cross-reference lists mean you still need to verify the terminal layout
• Owner experiences with solenoid longevity vary with battery condition and use

Bottom line: Good for owners who value direct-fit terminals and a wide number match, provided they check the post layout against their original part.

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Replaces 532192507 582042801 582042802 435-325, fits Poulan MTD Cub Cadet Trombetta, copper contacts, direct fit Starter Solenoid for Husqvarna 192507 Craftsman Lawn Tractor

Replaces 532192507 582042801 582042802 435-325, fits Poulan MTD Cub Cadet Trombetta, copper contacts, direct fit Starter Solenoid for Husqvarna 192507 Craftsman Lawn Tractor

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Best for: Owners of Poulan, MTD, Cub Cadet or Husqvarna lawn tractors who want copper contacts.

If your machine is a lawn tractor from one of the brands named in the title, this solenoid is aimed at your application. The copper contact emphasis is useful because worn or pitted contacts are a frequent cause of a clicking or dead-start condition.

Key specs

• Starter solenoid for lawn tractor applications
• Listed to replace 532192507, 582042801, 582042802 and 435-325
• Copper contacts

Pros

• Copper contacts are a durability-oriented feature for high-current switching
• Covers multiple brands that share similar electrical systems
• Direct-fit positioning is described in the listing

Cons

• Best suited to lawn tractors, so walk-behind owners should confirm compatibility
• Replacing the solenoid alone will not fix a discharged battery or a bad ignition switch

Bottom line: A practical choice for tractor owners with a clicking starter who want contact material highlighted in the listing.

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24 in. 201cc Electric Start Select PACE 6 Speed CVT High Wheel RWD 3-in-1 Gas Walk Behind Self Propelled Lawn Mower w/Blower

24 in. 201cc Electric Start Select PACE 6 Speed CVT High Wheel RWD 3-in-1 Gas Walk Behind Self Propelled Lawn Mower w/Blower

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Best for: Owners who have decided the repair is not worth it and want a complete self-propelled replacement.

If the mower is old, the deck is rusted or the starter circuit has failed in several places, a new machine may be the more sensible route. This model suits owners who want electric start, self-propulsion and a bagging or blower option in one unit.

Key specs

• 24 in. cutting width
• 201cc engine with electric start
• 6-speed CVT self-propelled drive with high wheels and rear-wheel drive
• 3-in-1 configuration with blower

Pros

• Electric start removes the need to pull a cord
• Variable-speed CVT drive suits varied terrain
• High-wheel design helps over uneven ground

Cons

• A full replacement mower costs far more than a solenoid and is only worth it for a worn-out machine
• Owners should still review the manual for the break-in and maintenance schedule

Bottom line: Best for owners who have ruled out a repair and want a self-propelled electric-start mower.

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Buying Guide

Confirm the Starter Solenoid Is the Actual Problem

Before buying a part, check the symptoms. A single loud click when you turn the key usually points to the solenoid or the battery. No sound at all often points to a wiring fault, a blown fuse or a safety switch. Clean the battery terminals and measure battery voltage with a multimeter. A fully charged 12V battery should read roughly 12.6 volts at rest. Consult a qualified small-engine technician if you are unsure about working around battery current.

Good picks for this: 146154 145673 Starter Solenoid 12V for Craftsman LT1000 Poulan 532145673 Husqvarna 532146154 AYP 109081X Lawn Mower; HipaLawn Mower 12V 4-Post Starter Solenoid

Match the Part Number and Terminal Layout

Read the stamped number on your existing solenoid and compare it against the cross-reference list in the listing. Also count the posts and note which terminals carry the heavy battery cable and which carry the smaller control wire. A four-post unit will not fit a two-post opening without modification.

Good picks for this: HipaLawn Mower 12V 4-Post Starter Solenoid; Starter Solenoid replaces 532192507 582042801 582042802 435-325

Check Brand and Equipment Compatibility

Solenoids are often shared across brands that use the same engine family or starter design. Still, shared numbers are not guaranteed. Compare the equipment type, such as walk-behind, self-propelled or lawn tractor, against the listing. Electrical layouts differ between walk-behind and tractor platforms.

Good picks for this: Starter Solenoid replaces 532192507 582042801 582042802 435-325; 146154 145673 Starter Solenoid 12V for Craftsman LT1000 Poulan

Contact Material and Build Quality

The solenoid’s internal contacts carry high current each time you start the engine. Copper contacts are commonly chosen for this job because copper conducts well and resists some wear. Pitted or burned contacts reduce voltage to the starter, which causes slow cranking or clicking.

Good picks for this: Starter Solenoid replaces 532192507 582042801 582042802 435-325; 146154 145673 Starter Solenoid 12V for Craftsman LT1000 Poulan

Decide Between a Part and a Whole Mower

A solenoid typically takes less than an hour to replace with basic hand tools. A new mower makes sense when the frame, deck or engine has other serious faults, or when repair estimates from a shop approach the cost of a new machine. Weigh the mower’s age, condition and how many repairs you have already made.

Good picks for this: 24 in. 201cc Electric Start Select PACE Gas Walk Behind Self Propelled Lawn Mower

Test Before You Reassemble

After installing the new solenoid, reconnect the battery and try the start circuit with the mower’s blade engagement off and the deck disengaged. Listen for a firm engagement click followed by starter rotation. If the solenoid clicks but the engine does not turn, check the starter motor and its brushes. For a broader troubleshooting sequence, see Troubleshooting a Lawn Mower That Won't Start: 8 Steps to Fix It.

Good picks for this: 146154 145673 Starter Solenoid 12V for Craftsman LT1000 Poulan 532145673 Husqvarna 532146154 AYP 109081X Lawn Mower

Preventive Care to Protect the Starting Circuit

Keep battery terminals clean and tight, and disconnect the battery during long storage or use a maintainer. Moisture and corrosion accelerate solenoid failure. Owners who see repeated starting trouble after winter may find Power Smart Lawn Mower Won't Start After Winter helpful, though that exact title is not on the reference list, so the general guide Toro Lawn Mower Won't Start After Winter: 7 Fixes That Work covers similar ground.

Good picks for this: HipaLawn Mower 12V 4-Post Starter Solenoid; 24 in. 201cc Electric Start Select PACE Gas Walk Behind Self Propelled Lawn Mower

FAQ

Why does my power smart lawn mower click but not start?

A single click usually means the solenoid is energizing but the starter motor is not receiving enough current. The most common causes are a weak or discharged battery, corroded terminals, or worn solenoid contacts. Test battery voltage first, then clean the terminals and check the solenoid.

How do I know which solenoid part number I need?

Remove the old solenoid and read the stamped or printed part number. Compare it against the cross-reference list in the product listing. Count the terminal posts and note their arrangement before you buy.

Can I use a solenoid from a different brand?

Sometimes, because several brands share starter designs. Confirm the voltage, terminal count and post layout match your original part. A matching cross-reference number is the strongest indicator of compatibility.

Is replacing a starter solenoid a difficult job?

For most owners with basic hand tools, it is a manageable repair. Disconnect the battery first, label the wires, and take a photo before removing them. If you are uncomfortable working with battery current, have a small-engine technician do the job.

Why does my mower start sometimes but not others?

Intermittent starting often points to a weak battery, dirty contacts or a loose connection. The solenoid may work when the battery is fully charged and fail when it is not. Clean all connections and test the charging system before replacing parts.

Should I replace the battery or the solenoid first?

Test the battery first. A battery that reads well below its rated voltage after charging will not supply enough current regardless of the solenoid. If the battery is healthy and you still hear a click, the solenoid or starter is the more likely fault.

When should I stop repairing and buy a new mower?

Consider replacement when the mower has multiple failing systems, the deck or frame is badly rusted, or repair costs approach the value of the machine. A solenoid fix is usually worthwhile on an otherwise sound mower.

Conclusion

When a power smart lawn mower won’t start, the starter solenoid is a logical first part to check and one of the most affordable to replace. The 146154 145673 Starter Solenoid stands out for its broad cross-reference list, while the HipaLawn Mower solenoid suits owners who want direct four-post fit and multi-number matching. The copper-contact solenoid is a sensible choice for lawn tractors, and the Select PACE self-propelled mower is the right answer for owners who have decided a complete replacement makes more sense than a repair. Always verify the part number and terminal layout against your original before ordering.

Sources

• Battery safety basics and how lead-acid batteries store and deliver energy (energy.gov)
• Guidance on safe handling of electrical equipment and battery maintenance in the workplace (osha.gov)
• Consumer safety information on power equipment and recalls (cpsc.gov)

Related reading

• Yardman Lawn Mower Won't Start: 8 Causes and Fixes (2026)

About Carter Bishop

Carter focuses on practical advice for lawn mowers: what matters before you buy, what to skip, and how to get more out of what you already own.