Overview – RELAY-CONTROL 12V DC 307-2873 Series
The Cummins RELAY-CONTROL 12V DC 307-2873 is part of a proven family of components used across Onan and Cummins generator set control circuits using 12 V DC relay logic, and several interchangeable part numbers share the same fitment.
Parts Characteristics
A plug-in control relay with a 12 V DC coil and screw or spade terminals, used to switch start, stop, fuel and alarm circuits inside generator control panels. The coil energises an armature that snaps the contact set between open and closed, letting a small control signal carry a much heavier panel load.
Applicable Models & Applications
Used across Onan and Cummins genset control panels on 12 V systems. Relay footprints and pin layouts differ between panel generations – match your relay by the number printed on its case, or send a photo of the old unit and we will confirm the replacement.
Maintenance & Replacement
Listen to the panel during start and stop sequences. A healthy relay clicks crisply; a chattering, buzzing or silent relay points at either the coil or its supply. Measure coil voltage at the socket during operation – a coil fed less than its rated voltage chatters and burns its contacts early.
When a circuit is dead, check the relay before the wiring: pull the unit, measure coil resistance across the coil pins for an open or shorted winding, and verify contact continuity opens and closes as the coil is powered. Most panel faults that look like controller failures are a two-dollar relay doing its last shift.
Replace relays as complete plug-in units – never open and dress the contacts. Contact pitting and material transfer change the contact pressure permanently, and a filed contact fails again within weeks, usually at night when the standby set is needed most.
Seat the replacement fully into its socket, confirm pin alignment before pushing, and re-torque any screw terminals. Keep one spare relay of each type in the panel pocket, labelled with its number, because the specific part is rarely stocked locally when a set fails to start.
Price Reference (USD)
The RELAY-CONTROL 12V DC 307-2873 generally falls in the USD 20-60 bracket, with expedited freight quoted separately.
Value & Service
We supply brand-new relays with the exact case number confirmed against your panel, shipped in protective packaging so the contacts arrive as clean as they left the factory.
The RELAY-CONTROL 12V DC family includes 307-3070; we can cross-check which one matches your serial number.
For critical Cummins Electrical Parts such as the RELAY-CONTROL 12V DC 307-2873, Racer Machinery offers both single units and bulk quantities with traceable sourcing.
