- Reduced charging capacity: A bad diode can prevent the alternator from generating the electricity needed to charge the battery and power the vehicle's electrical systems. This can lead to the battery becoming discharged and the vehicle eventually stalling.
- Overcharging: In some cases, a bad diode can cause the alternator to overcharge the battery, which can damage the battery and other electrical components.
- Damage to other alternator components: A bad diode can put additional strain on the other components of the alternator, potentially leading to premature failure of the entire alternator.
- Electrical system problems: A bad diode can cause electrical interference and other problems with the vehicle's electrical systems, such as flickering lights or malfunctioning electronics.
The exact time frame for how long a car can run with a bad alternator diode before it needs to be replaced depends on several factors, such as the severity of the diode failure and the vehicle's electrical demands. However, it is generally recommended to have the alternator inspected and repaired or replaced as soon as possible if a bad diode is suspected or diagnosed.
