Cummins/Onan RGA-IN1 — Power Relay Check (A11-K12)
Testing & diagnosis · Power relay A11-K12
For the Cummins/Onan RGA-IN1, from the Cummins/Onan service manual.
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Procedure
- Make certain genset starting battery is good.
- Unplug CB12-2A from circuit breaker.
- Locate S6 on genset, find grounded side using continuity tester.
- Use jumper to ground non-grounded side of S6.
- Use second jumper from B+ terminal on control board to apply B+ to SW B+ terminal. Fuel pump E5 should start and run.
- Remove B+ jumper. If fuel pump continues to run, K12 is good.
- If fuel pump stops, K12 has failed and A11 control board should be replaced.
- Push genset STOP button.
- Remove jumpers and reconnect CB12-2A.
Tools required
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.