Cummins/Onan — Battery Cable Checkout (B)
Testing & diagnosis · battery cables
From a Cummins/Onan service manual covering: DL4, DL6, DL6T. Check it applies to your exact model before use.
Applies to: Cummins/Onan DL4, Cummins/Onan DL6, Cummins/Onan DL6T
Procedure
- With the starter motor operating, check voltage drop from battery negative post to cylinder block.
- Check voltage drop from battery positive post to battery terminal stud on the solenoid.
- Normally each should be less than 0.3 volt.
- Clean all connections in any part of the circuit showing excessive voltage drop.
Tools required
- voltmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Each voltage drop normally less than 0.3 volt
Full service-parts list: 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.