Cummins/Onan M-1902s — Installation of Line Circuit Breakers in 50 Hz Generator Set
Installation
For the Cummins/Onan M-1902s, from the Cummins/Onan service manual.
Applies to: Cummins/Onan HDKA, Kubota V1505-E3BG engine
Before you start
- Only a qualified electrician should make this installation.
- Be sure to disconnect the starting battery ground cable to prevent accidental starting.
Procedure
- If set not yet installed, go to step 6; otherwise continue.
- Park the RV on as level a surface as possible; lock brakes and remove 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.
- Connect generator output leads L1, L2, and L3 to the circuit breaker (CB22).
- Run RV neutral lead and genset neutral lead to ground connection inside control box.
- Connect green leads from genset and RV to ground connection and tighten 1/4-20 screw.
- Secure conduit(s) to control box and reconnect the battery ground cable.
Tools required
- screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Connect L1, L2, L3 to breaker CB22; see AC wiring diagram page 11-4
Full service-parts list: Cummins/Onan HDKA →, Kubota V1505-E3BG 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.