Cummins/Onan — Field Windings Open Circuit Test
Testing & diagnosis
From a Cummins/Onan owner's manual covering: 1.5UF-232S, 10.0UF-150S, 12.0UF-3S, 12.0UF-4S, 15.0UB-150S, 15.0UF-3S/104, 2.0UF-125S, 2.0UF-232S/32, 2.0UG-1S/135, 2.5UF-1S, 2.SUD-IS, 2.SUD-IS/ID…. Check it applies to your exact model before use.
Browse Cummins/Onan generators & specs →
Procedure
- Place one test prod on one terminal end of the field winding.
- Place the other test prod on the other terminal end of the winding.
- The test lamp should light; if not, an open circuit is indicated.
- Check the terminal leads and loose terminals; replace the coil set if a coil is open.
Tools required
- test lamp set Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan owner's 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.