Katolight E6921M1 / REO2IMI — 12-Volt Test
Testing & diagnosis · Exciter field
For the Katolight E6921M1 / REO2IMI, from the Katolight service manual.
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Procedure
- Shut down system.
- Check for exciter leads labeled F+ and F-, or F+, F-, CF+, CF- on dual-field units; if not found, contact factory.
- Determine if generator is connected for high or low voltage.
- Disconnect, insulate, and identify external leads to regulator terminal board.
- Check for shorts and grounds in exciter shunt field.
- Start engine and bring to rated speed at no load.
- Using fully charged 12-volt battery, energize exciter field: CF+ and CF- on dual-field exciters, F+ and F- on single-field exciters.
- Measure and record all three line-to-line voltages at no load; they should balance within 1%.
- If correct ac voltage is not in GSI sheets, consult factory.
- If generator passes, check Regulator Manual for further tests.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Line-to-line voltages should balance within 1%
Source: Katolight 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.