Rotor - Cs144 Only

Scribe end frames to facilitate reassembly. Remove through-bolts and separate end frames. Using an ohmmeter, check for grounds. See Fig 1 . Reading should be very high or infinite. If reading is not as specified, replace rotor.

Fig 1: CS144 Alternator Rotor Test
Courtesy of GENERAL MOTORS CORP.
With an ohmmeter, check rotor for shorts and opens. See Fig 1 . Replace rotor if reading is not 1.7-2.1 ohms at 70°F (21.1°C).
To reassemble alternator, reverse disassembly procedure. Retain brushes with brush retaining pin during reassembly. See Figure . Remove retaining pin after tightening through-bolts.

NOTE: Manufacturer recommends using a new bearing whenever end frames are separated.