An alternator charges a vehicle’s battery. If the alternator is going or has gone bad, in most cases the vehicle can be driven for a short distance and for a short period of time, allowing you to make it to a service station or automotive parts store for a replacement alternator.

7 Signs of a Failing Alternator

• Dim or Overly Bright Lights.
• Dead Battery.
• Slow or Malfunctioning Accessories.
• Trouble Starting or Frequent Stalling.
• Growling or Whining Noises.
• Smell of Burning Rubber or Wires.
• Battery Warning Light on Dash.

A simple test to check the working of the alternator is by running your car; and then unplugging the positive connection of the battery. If the car stops, then you most likely have a problem with the alternator. Another simple test is to check your interior lights.

7 Signs of a Failing Alternator

1. Dim or Overly Bright Lights.
2. Dead Battery.
3. Slow or Malfunctioning Accessories.
4. Trouble Starting or Frequent Stalling.
5. Growling or Whining Noises.
6. Smell of Burning Rubber or Wires.
7. Battery Warning Light on Dash.

If any of these symptoms are evident, then follow these five steps to pinpoint the issue:

1. Perform a visual inspection under the hood. Look at the belt tension andcondition.
2. Visually inspect and test the batteries.
3. Measure system voltage.
4. Test alternator output.
5. Troubleshoot using the service manual.

It goes without saying that you’ll likely experience electrical problems in your BMW when you encounter alternator failure. Here are some of the most prominent electrical problems drivers experience: Accessory failure – It is most common for drivers to notice their accessories malfunctioning before any other more serious symptoms arise.

If the battery is good and the car is not charging, then the alternator or wiring is bad. With the car running, ask the mechnaic “what is the voltage across the battery?”.

For instance, the alternator is the sole power source that aids in recharging your car’s battery as you drive – that’s why after you jump start a battery you need to drive around the block a few times to allow the alternator to recharge it.

Odd sounds – Usually you won’t notice odd noises, like rattling, as the primary symptom of alternator failure; however, if the engine becomes compromised as a result of alternator problems, it can certainly lead to concerning noises alongside the other above-mentioned symptoms.