Cummins/Onan — Restoring Residual Magnetism - Method K
Repair & overhaul · Exciter field
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
- Connect a voltmeter across terminals E1 and E2.
- After starting set, touch positive lead of 6-volt dry cell lantern battery to F1 positive and negative lead to F2.
- When voltage starts to build up, remove battery leads.
- If voltage does not build up to normal and drops to zero when battery leads removed, trouble is faulty exciter component(s).
- May substitute 12-volt automotive battery if a 10-ohm resistance is connected in series to limit current.
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.