Honda GX390 Charging System Wiring Diagram

Honda GX390 Charging System Wiring Diagram

Honda GX390 is a powerful engine used in a variety of applications such as generators, water pumps, pressure washers, and many more. One of the essential components of any engine is the charging system, which keeps the battery charged and ensures reliable operation. In this article, we will discuss the wiring diagram for the charging system of the Honda GX390 engine.

The Charging System

The charging system of the Honda GX390 engine consists of three main components: the stator, the rectifier/regulator module, and the battery. The stator is a stationary part of the engine that produces an alternating current (AC) when the engine runs. The rectifier/regulator module converts the AC voltage to DC voltage and regulates the voltage to keep it at a constant level. The battery stores the electrical energy and provides power to the starter motor and other electrical components of the engine.

The Stator

The stator of the Honda GX390 engine has two windings: the lighting coil and the charging coil. The lighting coil produces AC voltage for the lighting circuit, while the charging coil produces AC voltage for the charging system. The charging coil has a higher output voltage than the lighting coil and is connected to the rectifier/regulator module through a three-wire connector.

The stator also has a ground wire that connects to the engine block to provide a reference point for the voltage measurements.

The Rectifier/Regulator Module

The rectifier/regulator module of the Honda GX390 engine is a single unit that performs two functions: rectification and regulation. The rectification process converts the AC voltage from the stator to DC voltage, which is required to charge the battery. The regulation process controls the voltage to keep it at a constant level and prevent overcharging or undercharging of the battery.

The rectifier/regulator module has three terminals: AC Input, DC Output, and Ground. The AC Input terminal is connected to the stator output, while the DC Output terminal is connected to the battery positive terminal through a main fuse and the starter solenoid. The Ground terminal is connected to the engine block and provides a reference point for the voltage measurements.

The Battery

The battery of the Honda GX390 engine is a 12-volt lead-acid battery that stores the electrical energy and provides power to the starter motor and other electrical components of the engine. The battery is connected to the rectifier/regulator module through the DC Output terminal and is protected by a main fuse.

The Wiring Diagram

The wiring diagram for the charging system of the Honda GX390 engine is shown below:

Wire Color Function
Black/Yellow Lighting Coil Output
Pink Charging Coil Output
Red/White DC Output (+)
Black Ground (-)
Red Main Fuse (+)
Red/Black Starter Solenoid (+)
Green/Black Oil Pressure Switch

Frequently Asked Questions

What is the voltage output of the charging coil?

The voltage output of the charging coil is approximately 14 volts AC at 3600 RPM.

What is the voltage output of the rectifier/regulator module?

The voltage output of the rectifier/regulator module is approximately 14.5 volts DC.

How do I test the charging system?

To test the charging system of the Honda GX390 engine, you need a voltmeter or multimeter. Start the engine and connect the voltmeter to the battery terminals. The voltage should be around 12.6 volts with the engine off. With the engine running at 3600 RPM, the voltage should be around 14.5 volts. If the voltage is too low or too high, check the connections and the components of the charging system.

What can cause the charging system to fail?

The charging system of the Honda GX390 engine can fail due to various reasons such as a faulty stator, rectifier/regulator module, or battery. Poor connections, damaged wiring, or a blown fuse can also affect the performance of the charging system. Regular maintenance and inspection can prevent premature failure of the charging system.