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Bench Testing: Rotor

WARNING: This page is about a different car, the 2002 Subaru Impreza, 2002 Subaru Forester, 2001 Subaru Impreza, and 2001 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect slip ring brush contact surface. If surface is worn or rough, smooth surface with fine emory paper. Measure slip ring diameter. See SLIP RING DIAMETER  table. If diameter is not as specified or brush contact surface is excessively worn or damaged, replace slip rings and/or rotor.
  2. Resistance across rotor slip rings should be about 3 ohms. See Fig 1 . If resistance is not as specified, replace rotor. Check continuity between each slip ring and rotor core/shaft, individually. See Fig 2 . Continuity should not exist. If continuity exists, rotor coil and/or slip ring is grounded. Replace rotor.
Fig 1: Checking Resistance Between Slip Rings
G00211654Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Checking Continuity Between Slip Ring & Rotor Core Or Shaft
G00211655Courtesy of SUBARU OF AMERICA, INC.
SLIP RING DIAMETER

Standard - In. (mm) Limit - In. (mm)
.894 (22.7) .870 (22.1)
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