Cummins Onan OEM 307-2570 Relay/ Starter Solenoid

The Cummins Onan 307-2570 Starter Solenoid Relay is a genuine OEM replacement for select Onan Emerald and Marquis RV generator sets. It functions as a high-current electrical switch, connecting battery power to the starter motor when the generator receives a start command.

A worn or damaged solenoid may prevent the starter from receiving sufficient power, potentially resulting in intermittent cranking, a clicking sound, or a no-crank condition. Because these symptoms can also be caused by a weak battery, poor cable connections, damaged wiring, or a faulty starter, the starting system should be properly diagnosed before replacing the solenoid.

Product Features:

• Genuine Cummins Onan OEM replacement part
• Starter solenoid and high-current starter relay
• Designed for select Onan RV generator sets
• Helps transfer battery power to the starter motor
• 12-volt electrical application
• Front-mounted 1/4-inch male quick-connect terminals for control wiring
• Sold individually
• Condition: New

Product Information:

• Manufacturer: Cummins Onan
• Brand: Cummins Onan
• Part number: 307-2570
• Alternate number format: 0307-2570
• Product type: Starter solenoid relay
• Quantity: 1

Compatible Generator Series:

• Select Onan BGE-series generators
• Select Onan BGM-series generators
• Select Onan NHM-series generators
• Select older Emerald RV generators
• Select older Marquis RV generators

Important Compatibility Notice:

Onan used several different starter-solenoid designs across the Emerald and Marquis generator families, and they may not be interchangeable. Confirm that the number stamped on the metal mounting bracket matches 307-2570 or 0307-2570.

Compatibility should also be verified using the generator’s full model number, specification letter, and serial number. This component is generally associated with older BGE, BGM, and NHM families and should not automatically be assumed to fit newer HGJ-series generators.

Installation Information:

Disconnect the generator’s starting battery and all external power sources before beginning service. Label each wire before removal and transfer the connections to the matching terminals on the replacement solenoid. Inspect the battery cables, terminals, mounting points, and control wiring for corrosion or damage during installation.

Follow the appropriate Cummins Onan service manual. Professional installation is recommended if the starting circuit has not been properly diagnosed or if terminal identification is uncertain.