2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Manual, Page 81Get this manual
IGNITION AND ELECTRICAL STARTER MOTOR Check: Armature coil continuity
Armature core
Digital tester Tester range: 1 +ITester probe connection Other Probe Probe Tester indicate
Continuity No continuity No continu ity
Commutator segment Commutator Commutator
Commutator segment Armature core Shaft
Measure: Brush length
Vernier calipers Standard: 12.5 mm (0.49 in) Service limit: 9.0 mm (0.35 in)