The Buckshot Racing #77 20 AMP Rectifier Regulator Billet Mount Kit is a high-performance, heavy-duty solution designed to replace and outperform a wide range of OEM and aftermarket components used in Mercury Marine, Mercury Racing, and Mariner V6 2-stroke outboards.
 
Our Top of Block CNC-machined billet mounting plate ensures secure installation with superior heat dissipation in that location and also block grounding — essential for long-term durability in high-performance boating conditions.
 
It mounts where Mercury mounted the stand-alone 2-wire (one red and one yellow) 88825-A7 regulator on the 2.4 Liters and high-performance 2.5 Liters. It also eliminates the need for the Mercury 816770 3-post Rectifier on the electrics plate.
 
This 20 AMP-rated dual-function ignition part operates as both a rectifier, converting AC output from the stator to DC, and a voltage regulator, stabilizing output voltage to protect batteries and onboard electronics.
 
It fully replaces Mercury Marine part numbers 88825A7, 88825A1, and CDI Electronics 194-8825, while also serving as a direct replacement for numerous widely used part numbers, including 154-6770, 88825, 88825-A2, 88825-A5, 88825-A6, 88825-A7, 18-5707, 49184, 62351A1, 62351A2, 70350A1, 70350A3, 72310, 8M0058226, 816770, 816770T, and 9-17100.
 
This system is engineered for Mercury 135 HP, 150 HP, 175 HP, 200 HP, 220 HP (2.4), 225 Pro Max, 245 HP Carb, 260 EFI (2.5), and 300 Drag 2-stroke powerheads, across 2.0L, 2.4L, and 2.5L V6 engine platforms, making it suitable for models such as the Black Max 150, SST-120, SST-140, XR2, XR4, XR6, 200 Super Magnum, Pro Max, and EFI Racing and Sport Jet variants.
 
With a regulated output capacity of 20 amps, this rectifier regulator is ideal for use with 9 AMP and 16 AMP CDI ignition systems, which are prone to overcharging at high RPMs due to limited factory regulation. By maintaining voltage within optimal ranges, this system prevents premature battery failure, voltage-induced overheating, and electronic malfunction in high-strain marine applications.
 
Particularly valuable in high-performance environments, the Buckshot Racing #77 is the go-to solution for river runners, F1 tunnel boat competitors, circle boat racers, and outboard drag racing teams running 16 AMP stators at extended RPMs.
 
Likewise, it offers reliable voltage control for competitive bass anglers, where prolonged throttle use at elevated speeds often leads to voltage climb and thermal stress in standard regulators.
 
In applications using 40 AMP stators, two Buckshot #77 regulators can be stacked on the billet aluminum plate using extended bolts, effectively splitting the electrical load between dual units to avoid single-regulator failures common in high-output systems.
 
It also supports coil relocation, working in tandem with Buckshot Racing #77 Billet Coil Mount Plates, which are frequently used in performance setups to reposition coils for race cowl compatibility or custom rigging.
 
The integrated layout allows for the simultaneous relocation of ignition coils and dual rectifier regulators (by stacking on this plate), improving engine bay organization, airflow, and serviceability.
 
For Mercury outboard owners demanding stable voltage regulation and enhanced system protection under race or endurance conditions, the Buckshot Racing #77 20 AMP Rectifier Regulator Kit delivers a well-rounded solution that meets both OEM compatibility and performance upgrade requirements.
 
Its broad part number replacement list — including OEM and aftermarket numbers like 154-6770, 18-5707, 49184, 62351A1, 62351A2, 70350A1, 70350A3, 72310, 8M0058226, 816770, 816770T, and 9-17100 — ensures maximum versatility for service professionals and enthusiasts alike.
 
Includes one (1) Billet Mount Plate w/ two (2) Stainless Button Head Bolts and two (2) screws to mount the plate on the top of the block.
 
1) Select your Color, 2) Add one (1) 20 AMP Rectifier Regulator, 3) Add two (2) 20 AMP Rectifier Regulators
 
Installation Guidance:
 
Mounting: Not all blocks are pre-drilled for mounting screws, drilling more than 1/2" into the block may breach you water channel. Use Loctite Threadlocker Red 271 on 1/4-20 Bolts.
 
Wiring: Depending on your other igintion components, wiring with split connectors may be required to connect the 20 AMP Units. Below is the Buckshot Racing #77 / 20 AMP
Mercury Rectifier Regulator Wiring Guide:
 
Yellow Wire (x2)
Function: Stator AC Input (Phase A & B)
Purpose: Connects to the two yellow stator output leads (AC voltage input)
Note: These two wires are interchangeable
 
Red Wire
Function: DC Output (Battery Positive)
Purpose: Sends regulated charging voltage to the battery or power distribution point
Important: Use a fuse or circuit breaker in-line for safety
 
Grey Wire
Function: Tachometer Signal
Purpose: Provides tach signal derived from stator pulses for RPM gauge
Optional: Only needed if a tachometer is in use
 
Black Wire
Function: Ground (Negative)Purpose: Provides grounding path to engine block or electrical ground bus.
Important: Must be mounted to the bolt going into the plate or any unpainted surface on the block for reliable grounding and heat dissipation.
 
Contact Mike Hill at +1-714-697-1716 or email mike@buckshotracing77.com for technical support.