Cummins/Onan G1250s / M-1902s — Installation of Line Circuit Breakers in 50 Hz Generator Set
Installation
For the Cummins/Onan G1250s / M-1902s, from the Cummins/Onan service manual.
Applies to: Cummins/Onan HDKA, Kubota V1305-B engine
Before you start
- Only a qualified electrician should make this installation.
- Be sure to disconnect the generator set starting battery ground cable to prevent accidental starting.
Procedure
- Park the recreational vehicle on as level a surface as possible, lock the brakes, and remove the ignition key.
- Disconnect the generator set starting battery ground (-) cable at the battery.
- Remove the cover from the genset control box on the generator set.
- Mount the circuit breaker assembly in the control box using screws and washers that held the cover plate.
- Connect the generator output leads L1, L2, and L3 to the circuit breaker as illustrated on Page 11-4.
- Run the RV neutral lead into the control box and connect it to the ground connection.
- Connect the green lead from the genset and the green lead from the RV to the ground connection.
- Secure the conduit(s) to the control box and reconnect the starting battery ground cable.
Tools required
- screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan HDKA →, Kubota V1305-B engine →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.