Starter No Load Test
To perform test, connect a tachometer, ammeter and voltmeter into start circuit. See Fig 1. Adjust carbon pile to voltage indicated in Starter Specifications. See STARTER SPECIFICATIONS . Read current draw and armature speed to ensure they are within specifications.
DO NOT apply voltage greater than specified, as excessive voltage may cause armature to throw windings due to excessive speed.
Low free speed and high current draw indicates too much friction, shorted armature, or grounded armature or fields. Failure to operate with high current draw indicates a direct ground in terminal or fields or frozen bearings.
Failure to operate with no current draw indicates an open field, open armature coils, or broken brush springs, worn brushes, or high commutator insulation. If no-load speed is low and there is low current draw, suspect high internal resistance due to poor connection, defective leads, or dirty commutator. A high free speed and high current draw usually indicates shorted fields.