12V 3 Terminal 108-5349-00 Starter Solenoid for Bad Boy Zero Turn Mowers CZT, ZT Elite, MZ Magnum - Replaces 108-0001-00 Trombetta 852-1251-210-50 Lawn Mower Solenoid Relay Switch

12V 3-Terminal 108-5349-00 Starter Solenoid

Key Features

• 12V DC starter solenoid relay for lawn mower electrical systems.
• Three-terminal configuration: two upper copper studs and one lower stud with a male spade terminal.
• Upper studs measure 5/16 inches; the lower stud and male spade terminal are 1/4 inch.
• Transfers battery power to the starter motor for engine cranking and startup.
• Copper contacts and internal copper windings support stable electrical conductivity.
• ABS plastic housing is designed to resist wear, impact, and outdoor operating conditions.
• Automatic operation mode; package includes one solenoid starter relay switch.

Replaces

This starter solenoid replaces Bad Boy part numbers 108-5349-00 and 108-0001-00, as well as Trombetta part number 852-1251-210-50.

Cross-Reference Part Numbers

• 108-5349-00
• 108-0001-00
• 852-1251-210-50

Compatibility & Fitment

Designed for Bad Boy zero-turn mowers, including CZT, ZT Elite, and MZ Magnum models. Confirm the engine model, existing part number, and terminal arrangement before ordering. This solenoid requires a 3-terminal layout with two upper studs and one lower stud; 4-terminal and other configurations are not compatible.

When to Replace

Replace the solenoid when the starter does not receive battery power, the mower produces a click without cranking, or the engine cranks intermittently despite a charged battery and sound cable connections. Corrosion, loose terminals, restricted current flow, short circuits, and repeated overload can cause relay failure or contact damage.

Installation Tips

• Disconnect the battery negative (-) terminal and remove the spark plug wire before installation.
• Match each wire to the mower's wiring diagram and verify polarity before connecting the replacement.
• Confirm the two 5/16-inch upper copper studs and the 1/4-inch lower stud with male spade terminal match the original layout.
• Tighten all electrical connections securely to reduce arcing, resistance, and premature failure.
• Insulate exposed copper strands and inspect the wiring for short circuits or damaged insulation.
• A basic hand-tool replacement generally takes only a few minutes when the wiring and mounting access are clear.
• Lifetime protection is provided for product defects or issues.