What are the reasons for insufficient starter power?
3 Answers
The main reasons for slow and weak starter rotation: 1. The battery is undercharged, or the internal resistance is too high due to battery aging. 2. Severe wear of the starter bearings causes misalignment during the rotation of the DC motor, resulting in friction between the stator and rotor, which releases kinetic energy and reduces output power. 3. Severe wear of the starter brushes or loss of elasticity in the brush springs leads to poor contact between the brushes and the commutator, preventing continuous transmission of electrical energy, thus causing insufficient starter power. Replacing the brushes or brush springs can resolve this issue. 4. Long-term wear causes the commutator to become out-of-round, and the mica segments of the commutator protrude, increasing the contact resistance between the carbon brushes and the commutator and reducing the starting current. At this point, the starting torque of the starter will significantly decrease, leading to a weak starter. In this case, the rotor of the DC motor needs to be replaced.
I've been repairing cars for many years, and there are several common reasons for insufficient starter power. The most common situation is insufficient battery power, where an aged battery or one that hasn't been started for a long time results in low voltage and weak starting. Loose or corroded wiring connections increase resistance and reduce current. Worn carbon brushes or commutator faults inside the starter can also weaken the starting power. Cold weather can worsen the situation as thick engine oil increases the engine's burden. I recommend first using a multimeter to check the battery voltage, which should normally be above 12 volts; inspect the wiring for cleanliness and tightness. Regular maintenance of the starter can prevent roadside breakdowns, and it's best to have a professional technician diagnose the issue.
I don't have much driving experience, but I've encountered several instances of difficult starts with slow cranking. A friend explained it might be due to a weak battery or corroded terminal connections. Simply put, it's either insufficient power supply or loose connections, especially making winter starts more strenuous. I regularly check the battery water level and clean the connection points to avoid being stranded on the road. If the starter motor's internal carbon brushes are worn out, it can also lead to reduced power, which requires professional tools for detection. Keeping the vehicle in frequent use can prevent issues. When problems occur, avoid repeated starting attempts to prevent component damage, and seek to recharge the battery or have it checked by a professional as soon as possible.
