Cummins/Onan — Battery Cable Check
Testing & diagnosis · Battery cables
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDKC, Cummins/Onan MDKD, Cummins/Onan RGA-OP'
Procedure
- With 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 solenoid.
- Each should normally be less than 0.3 volts.
- 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 less than 0.3 volts.
Full service-parts list: Cummins/Onan MDKC →, Cummins/Onan MDKD →, Cummins/Onan RGA-OP' →
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.