Cummins/Onan DL3 — Flashing the Field
Repair & overhaul · Exciter field
For the Cummins/Onan DL3, from the Cummins/Onan service manual.
Applies to: Cummins/Onan L Series Diesel engine
Before you start
- Incorrect flashing procedure can damage the generator or regulator components.
Procedure
- Assemble a 12-volt storage battery, 10-amp fuse, momentary-on switch, and diode as shown in Figure 4-2.
- Remove generator end bell cover.
- Connect positive (+) battery lead to F1+ terminal and negative (-) battery lead to F1- terminal on end bell terminal board.
- Start generator set and operate at normal speed.
- Close momentary switch just long enough for output voltage to build up, but no longer than 5 seconds.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Do not keep excitation circuit connected longer than 5 seconds.
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.