HZ 12V Voltage Regulator 845907/394890 Replacement for Briggs & Stratton — Rectifier, Plug-and-Play Fit

This replacement regulator from HZ restores the charging system on compatible lawn and garden equipment by regulating alternator output and converting AC to DC for the battery. It is engineered to match the mounting, connectors, and electrical ratings of common Briggs & Stratton part numbers (including 845907, 394890, 797375, 393374 and 691185) and fits a wide range of engine and mower models. The unit is useful when the original regulator fails, causing undercharging, overcharging or electrical irregularities.

Which engine and mower models will this HZ regulator fit?

HZ designed this regulator to be compatible with many Briggs & Stratton engines and equipment brands that used those factory part numbers. It covers popular small-engine model families and a variety of riding and zero-turn mowers.

• Direct replacements for Briggs & Stratton numbers: 845907, 394890, 797375, 393374, 691185, 797182.
• Fits engine model groups like 161430, 161432, 161436–161452, 190401–196400, 216977, 226400 and related series.
• Compatible with JD model L120, LA175, Z245, Z425 and multiple John Deere lawn tractor lines.
• Also listed for applications in Husqvarna, Cub Cadet, Craftsman and many To-Ro tractors and snowblower-equipped units.

How does this regulator solve charging or electrical problems?

The regulator/rectifier stabilizes alternator output and converts alternating current to the direct current your battery and electrical system need. Replacing a faulty regulator can stop battery drain, dimming lights, erratic gauges or blown bulbs without replacing the stator or alternator in many cases.

• Maintains correct voltage to prevent overcharging or undercharging of the battery.
• Rectifies AC alternator output into steady DC for electrical accessories and ignition systems.
• Plug-and-play mounting and connector layout match common OEM installations for straightforward replacement.

What electrical specifications and engine sizes are supported?

This HZ unit is specified for 12-volt systems used on many Briggs & Stratton engines ranging from about 18 to 27 horsepower, and it is compatible with alternators rated for common charging currents. Check your equipment’s part number cross-reference and charging amp specification before ordering.

• Designed for 12 V charging systems found on small engines and riding mowers.
• Commonly used with 10A, 13A, 14A and 16A charging setups across listed engine families.
• Matches electrical and mechanical interfaces of the OEM part numbers listed in the cross-reference.

How easy is installation and what should I verify before replacement?

Installation is straightforward for someone comfortable with basic mower maintenance: disconnect the battery, remove the old regulator, transfer any bracket hardware if needed and connect the plug or spade terminals. Always confirm part compatibility and check wiring and connectors for corrosion before fitting the new unit.

• Disconnect battery negative cable before starting to avoid shorts.
• Compare connector style and mounting hole spacing with your old regulator for a fit check.
• Inspect stator wiring and connector condition; replace damaged wiring as needed to ensure proper function.

Who is this for: Owners, repair shops and equipment fleet managers who need a reliable, cost-effective replacement regulator/rectifier for Briggs & Stratton-powered mowers and related small-engine equipment. It’s suited for people who want a direct-fit part to restore normal charging behavior without replacing the entire charging assembly.