Cummins/Onan — Control wiring connections
Installation · Diesel fuel tank control
From a Cummins/Onan service manual covering: 4A2.3, 6A3.4-GS, 6AT3.4-GS, DL4, DL6, QSA3, QSA4, QSA6. Check it applies to your exact model before use.
Applies to: Cummins/Onan DGAB, Cummins/Onan DGAC, Cummins/Onan DGAD, Cummins/Onan DGAE, Cummins/Onan DL4, Cummins/Onan DL6
Procedure
- Remove control cover for access to wiring terminals.
- Connect float switch wiring harness plug to receptacle J5 on PCB.
- Connect five leads of pump wiring harness to appropriate terminals on control PCB.
- Connect 120 VAC or 240 VAC power supply to appropriate control terminals; factory setup is 240 VAC.
- For 120 VAC, remove jumpers TB1-6 to TB1-7; install jumpers TB1-5 to TB1-6 and TB1-7 to TB1-8; move S103 to up position.
- Use two-lead wire harness to connect TB1-19 to positive starter solenoid terminal and TB1-20 to negative terminal.
- Connect TB1-14 and TB1-15 to shut down engine under low fuel conditions.
- Terminals TB1-10 through TB1-17 and TB2-23 through TB2-27 are available for remote annunciators.
Tools required
- Screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Factory power connection is 240 VAC; selector switch S103 down for 240 V and up for 120 V.
Full service-parts list: Cummins/Onan DGAB →, Cummins/Onan DGAC →, Cummins/Onan DGAD →, Cummins/Onan DGAE →, Cummins/Onan DL6 →
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.