Cummins/Onan — Build-up Relay Coil Testing - Method H (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
- Isolate coil by disconnecting one of its leads.
- Adjust meter to indicate center scale resistance reading, connect meter leads to coil.
- Good if 525 ohms ±10 percent resistance is measured.
- Defective if no resistance or low resistance indicated; replace relay.
Tools required
- ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 525 ohms ±10 percent
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.