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 works as a high-current electrical switch. When the generator receives a start command, it connects battery power to the starter motor.

This 12-volt starter relay is sold individually and is supplied new. Please read the compatibility notice below before you order. Onan used several different starter-solenoid designs across its generator families, and they may not be interchangeable.

Why Choose the Cummins Onan 307-2570 Starter Solenoid Relay

A worn or damaged solenoid may prevent the starter from receiving enough power. This can lead to intermittent cranking, a clicking sound, or a no-crank condition. A genuine Cummins Onan OEM replacement lets you restore the starting circuit with the manufacturer’s own part.

These symptoms can also be caused by other problems. A weak battery, poor cable connections, damaged wiring, or a faulty starter can produce the same signs. For this reason, the starting system should be properly diagnosed before you replace 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 Onan RV Generator Series

The Cummins Onan 307-2570 is intended for select generators in these families:

• 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. They may not be interchangeable. Confirm that the number stamped on the metal mounting bracket matches 307-2570 or 0307-2570.

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

If you are unsure, check these details against your generator’s records before you buy the Cummins Onan 307-2570.

Installation Information

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

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.

Frequently Asked Questions

What does the Cummins Onan 307-2570 starter solenoid relay do?

It acts as a high-current switch. When the generator receives a start command, it connects battery power to the starter motor.

Is 0307-2570 the same as 307-2570?

0307-2570 is the alternate number format for this part. Check that the number stamped on the metal mounting bracket of your original solenoid matches either 307-2570 or 0307-2570.

Will this solenoid fit newer HGJ-series generators?

Do not assume that it will. This component is generally associated with older BGE, BGM, and NHM families. Always verify your generator’s full model number, specification letter, and serial number first.

Ready to restore your generator’s starting circuit? Confirm your part number and generator details, then order the genuine Cummins Onan 307-2570 today.

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