Cummins/Onan — Switch Checkout
Testing & diagnosis · Switches
From a Cummins/Onan service manual covering: DL4, DL6, DL6T, DL6U. Check it applies to your exact model before use.
Applies to: Cummins/Onan DL4, Cummins/Onan DL6, Cummins/Onan DL6T
Procedure
- Remove battery B+ cable.
- Place ohmmeter leads across switch.
- Open and close switch while observing the ohmmeter.
- NO switch: infinite resistance open, continuity closed. NC switch: reverse.
- Replace switch if defective.
Tools required
- ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.