How to Repair a Non-Charging Generator?
2 Answers
Repair methods for a non-charging generator: 1. If the generator belt is broken or slipping, tighten the adjustment device or replace the belt; 2. Check the condition of the wiring, and repair any open circuits; 3. If there is any sticking in the rotor part, manually test whether it rotates smoothly; 4. If the coil is damaged, use a multimeter to measure the coil resistance to see if it is normal; 5. If there is no resistance value, the coil must be rewound or the motor replaced. Methods to detect a non-charging car generator: 1. Use the voltage range of a multimeter for detection; 2. Use an external ammeter for detection; 3. The test lamp method; 4. Change the engine speed and observe the brightness of the headlights; 5. Remove the battery grounding to see if the engine works.
Last time my old Jetta's alternator quit, it took me three days to fix it. First step is testing battery voltage - if it stays below 13.5V after starting, that basically confirms the issue. Then check if the alternator belt is cracked or loose, as belt slippage can also cause charging failure. Pay special attention to brush wear - many old cars stop generating power when the brushes wear down. Remember to disconnect the negative battery terminal before removing the alternator cover - you can replace the brush assembly with just a Phillips screwdriver. If the rectifier bridge feels hot or smells burnt, the whole alternator needs professional repair. In emergencies, I've tried gently tapping the alternator housing with a wrench - sometimes this can temporarily restore power by unsticking jammed brushes. Final reminder: never force operation if you hear bearing noise - my friend kept driving and burned out the windings last time, costing him an extra 800 yuan in repairs.
