What are the causes of weak starter operation?
2 Answers
The causes of weak starter operation are as follows: 1. Insufficient battery charge or loose, poorly connected wiring. 2. Starter bearings that are too tight or excessively loose. 3. Burnt starter switch contacts or short-circuited solenoid switch coils. 4. Open or short-circuited series auxiliary coils in the armature-moving starter. The following are steps to troubleshoot weak starter operation: 1. Turn the starter switch to the start position. If the engine rotates during decompression but the electric starter does not turn or struggles when not decompressed, it is likely due to insufficient battery charge or oxidized wiring connections. 2. If the electric starter rotates very slowly during decompression and sparks occur at the commutator, it is mostly caused by poor contact due to worn carbon brushes or commutator, or short-circuited commutator copper segments. 3. If the electric starter rotates very slowly during decompression, accompanied by noise or smoke, it is mainly caused by friction between the armature and magnetic poles or damaged coil insulation.
The starter motor is weak to start, and I have encountered this problem many times, which is often related to insufficient battery power. Especially on winter mornings, low temperatures can reduce the battery's discharge capacity, making starting particularly difficult. In addition, the failure of the starter motor itself is also a major cause, such as excessive wear of the internal carbon brushes or burning of the commutator, which reduces the efficiency of power conduction. Starter motor bearing seizure or rotor coil short circuit can also cause weak rotation. Another easily overlooked point is poor line contact, loose or corroded battery terminals can increase resistance. Moreover, if the vehicle is parked for a long time, moisture and oxidation of the lines will exacerbate the problem of poor contact. I recommend checking the battery voltage first and then using a multimeter to measure the voltage drop during startup to quickly locate the source of the problem.
