Acura NSX 1991 Manual page 756

Main Menu
Starting System
Solenoid Plunger Inspection
Check the contact points and face of the starter
solenoid plunger for burning, pitting or any other
defects. If surfaces are rough, recondition them with a
strip of #500 or #600 sandpaper.
CONTACT POINTS
Table of Contents
SOLENOID
PLUNGER
POINT CONTACTING
FACE
Starter Field Winding Test
1. Check for continuity between the brushes.
there's no continuity,
housing.
2. Check for continuity between each brush and the
armature housing (ground).
If continuity exists, replace the armature housing.
ARMATURE HOUSING
(GROUND)
If
replace the armature
BRUSHES