CS144 (Without Auxiliary Phase Terminals)

Scribe end frames to facilitate reassembly. Remove through-bolts and separate end frames.
With ohmmeter set to its lowest range, measure coil resistance between slip rings. See Fig 1. Replace rotor if coil resistance is not 1.7-2.1 ohms at 70°F (21°C).
With ohmmeter set to its highest range, check for grounds between either slip ring and rotor pole piece. See Fig 1. If reading is not close to infinite, replace rotor.
To reassemble generator, reverse disassembly procedure. Retain brushes with brush retaining pin during reassembly. See Fig 2. Remove retaining pin after tightening through-bolts.

Fig 1: Testing Generator Rotor (CS144)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Removing Brushes (CS144)

Courtesy of GENERAL MOTORS CORP.