Cummins/Onan — Resistor Testing - Method G (Ohmmeter)
Testing & diagnosis
From a Cummins/Onan service manual covering: 02SX1N1A, 04SX1N, 04SX1N1A, 04SX1N1B, 04SX1N2B, 04SX1N3B, 04SX1N4B, 06SX1N, 06SX1N1A, 06SX1N1B, 06SX1N2B, 06SX1N3B…. Check it applies to your exact model before use.
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Procedure
- Measure resistance with an ohmmeter.
- See Table 3 for selecting resistance range (RX10, RX100, etc.) so readings are near center of meter scale.
- Isolate resistor by disconnecting one end before measuring resistance.
- Good if measured resistance falls within ±20 percent either way of Table 3 value.
- Defective if no continuity through resistor or measured resistance exceeds allowable tolerance.
- Stabilizing resistor can be adjusted to bring specified resistance within required limits.
Tools required
- ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- resistance within ±20 percent of Table 3 value
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.