Cummins/Onan — Converting the Day Tank Controller from 240 VAC to 120 VAC
Installation
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFAA, Cummins/Onan DFAB, Cummins/Onan DFAC, Cummins/Onan DFBF, Cummins/Onan DFCB, Cummins/Onan DFCC, Cummins/Onan DFCE, Cummins/Onan DFE
Procedure
- Remove the two jumpers between terminals TB1-6 and TB1-7 in the control box.
- Connect one jumper between TB1-5 and TB1-6 and the other between TB1-7 and TB1-8.
- Move selector switch S103 on the control PCB to the up position for 120V.
- If equipped with a transformer, remove the two jumpers between H2 and H3 and connect one between H1 and H3 and the other between H2 and H4.
Tools required
- Screwdrivers Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan DFBF →, Cummins/Onan DFCC →, Cummins/Onan DFCE →, Cummins/Onan DFE →
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.