Cummins/Onan DL3 — Battery Cable Checkout
Testing & diagnosis · Battery cables
For the Cummins/Onan DL3, from the Cummins/Onan service manual.
Applies to: Cummins/Onan L Series Diesel engine
Procedure
- With starter motor operating, check voltage drop from battery negative post (not cable clamp) to cylinder block.
- Check voltage drop from battery positive post to battery terminal stud on solenoid.
- Normally each should be less than 0.3 volt; slightly higher may result with extra long battery cables.
- Thoroughly 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
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.