Cummins/Onan RGA-IN1 — Voltage Regulator Test
Testing & diagnosis
For the Cummins/Onan RGA-IN1, from the Cummins/Onan service manual.
Browse Cummins/Onan generators & specs →
Procedure
- Stop generator set.
- Unplug voltage regulator from wiring harness.
- Connect 6-volt lantern battery to F1/F2 terminals as illustrated.
- Start generator set.
- Measure output at S1-S2 (pins 2 and 3): should be 120 VAC ± 20 VAC.
- Measure output at Q1-Q2 (pins 11-12): should be 160 VAC ± 20 VAC.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 120 VAC ± 20 VAC
- 160 VAC ± 20 VAC
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.