In case of failure of starter, make sure that the wires are tightly attached to the terminals of the solenoid. Connect a voltmeter or 12 volt test lamp to the large contact on the solenoid and a permanent earthing point, the large contact should be connected directly to the battery, battery voltage ought to show, or the test lamp should light with or without ignition on. Then unconnect the small wire to the spade on the solenoid, and put all-metal between the wire and earth, that is, voltmeter or test lamp; and with ignition on the battery voltage must be read. Otherwise, check the ignition switch and the wiring connected to it, and reconnect the wire. Fit voltmeter or test lamp between the field terminal to the solenoid and earth, and ensure the ignition key is switched to starting position and ensure the battery voltage is read. In case of zero voltage, but the above tests are positive, then the solenoid contacts are defective. Under the circumstances that the battery voltage is present and the starter is not working, then the problem can be the windings, the armature, or the brushes of the starter.