Cummins/Onan — Connecting the Battery to the Generator Set
Installation
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFEJ, Cummins/Onan DFEK, Cummins/Onan QSX15-G9 engine
Before you start
- Even momentary incorrect connection can cause damage to the electrical system.
Procedure
- Secure the battery; hold-down bolts must be tight but not over-tight.
- Smear the terminals with petroleum jelly, if necessary.
- Fit the vents firmly in position and make sure the battery is clean and dry.
- Verify correct polarity when connecting the battery to the set.
- Use an insulated wrench to connect the positive generator cable first, followed by the negative cable.
Tools required
- Insulated wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan DFEJ →, Cummins/Onan DFEK →
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.