Cummins/Onan — Changing Sensitivity Reference (UR Regulator)
Adjustments · Voltage regulator PC board VR21
From a Cummins/Onan service manual covering: 15.0YD-3G, 20.0YD-3G, 20.0YD-5DG, 25.0YD-3G, 25.0YD-5DG, 30.0YD-3G, 30.0YD-5DG, 6.0-3CS1, 7.5-3CS1. Check it applies to your exact model before use.
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Procedure
- Locate W1 on VR21 at S (semi-frequency sensitive).
- Unsolder W1 and resolder to hole F for frequency sensitive.
- Or resolder to hole N for non-frequency sensitive.
Tools required
- soldering iron 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.