User's Manual

This is a replacement control board for Cummins / Onan 0300-5374 and 300-5374.

Fits HGJAB (Spec A through E) and HGJAC (Spec A through C)

2 year mfg. warranty - Not 90 days like the original!

• Exact fit replacement for Onan 300-5374 control module.
• Status indications for cranking and normal running.
• Checks oil pressure switch and wiring prior to cranking engine.
• Does not shut down on every little problem like the original part does.
• Advanced detection system checks the conditions of your brushes, slip rings, and rotor while cranking. These are the most common issues that damage a controller. The generator will not start if damage is probable.
• Includes improved fault code system.
• Since the engine keeps running, normal troubleshooting methods can be used.
• Over-sized heat sink for cooler operation.
• Encapsulated in automotive grade urethane.
• Two year warranty!

Please note that this part is NOT compatible with Vehicle Monitoring Systems like Silverleaf/Rozie.

**IMPORTANT The standard 300-5046 is designed for RV applications and will NOT replace the 300-5046-01 used in home standby applications.

• Part #: 3005374-A