- a) Battery is faulty;
- b) The quality of the electrical connection between the ignition switch, starter solenoid, battery and starter motor is impaired;
- c) The traction relay is faulty;
- d) There is mechanical or electrical damage to the starter motor.
2. To check the battery, turn on the headlights. If after a few seconds the headlights become dim, the battery is discharged and needs to be recharged or replaced (see section Checking the battery status and charging). If the brightness of the headlights does not change, turn the ignition key - if this time the brightness of the glow decreases, then the current reaches the electric motor and the starter itself is faulty. If the brightness of the headlights still remains unchanged and there is no click of the traction relay, then there is a malfunction of the relay itself or its electrical circuit. If the starter rotates too slowly, and the battery charge level is normal, then either the starter itself is faulty, or the resistance in the circuit is excessively high.
3. If you suspect a fault in the electrical circuit, disconnect all wires from the battery (including ground busbar to the body). Also disconnect the wiring from the starter/solenoid and the ground bus of the power unit. Thoroughly clean the contact terminals, then restore the original wiring connection and use a voltmeter or test lamp to ensure that full voltage is present at the terminal connecting the positive battery cable to the solenoid. Make sure the ground is in good condition. To prevent corrosion, lubricate the terminal connections of the battery terminals with acid-free petroleum jelly - remember that corrosion is the most common cause of poor electrical connections.
4. If the battery and all electrical connections are found to be in good condition, check the circuit itself. Disconnect the wire from the blade terminal of the starter solenoid. Connect a voltmeter between the end of the wire and a well-grounded point (for example, the negative terminal of the battery) and make sure there is power in the circuit with the ignition key turned to the START position. If power is supplied correctly, then the circuit is OK. If there is no voltage, check the condition of the circuit.
5. The contact connections of the traction relay can be checked by connecting a voltmeter or test lamp between the power terminal on the side of the relay facing the starter and the ground. When the ignition key is turned to the START position, voltage should be present. Otherwise, the traction relay must be replaced.
6. If the electrical circuit and traction relay are found to be in good condition, the cause of the failure may lie in the failure of the starter motor and further testing is beyond the skill of the average amateur mechanic. Before seeking help from specialists, do a little marketing by comparing the prices of components with the cost of a new or refurbished unit.
(View the original on the website: Skodabook.ru)