Cummins/Onan DL3 — Wiring Harness Check
Testing & diagnosis
For the Cummins/Onan DL3, from the Cummins/Onan service manual.
Applies to: Cummins/Onan L Series Diesel engine
Procedure
- Inspect all wires for breaks, loose connections and reversed connections; refer to applicable wiring diagram.
- Remove wires from terminals at each end and using an ohmmeter check each wire end to end for continuity or opens.
- Using an ohmmeter, check each wire against each of the other wires and to ground for shorts or insulation breaks.
- Reconnect or replace wires following the applicable wiring diagram.
Tools required
- Ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.