Hi @mel6589 ,
The car's alternator may be failing (more correctly the regulator within the alternator) or perhaps the fan belt may be slipping or loose causing the car's battery and electrics not to receive the correct amount of voltage.
If you have a DMM (Digital Multimeter) you can use its' Voltmeter function to measure the output of the alternator.
1. With the engine switched OFF, measure the voltage across the car's battery terminals. On a good battery it should read around the 12V DC mark.
2. Ensure that the car is either in Park (automatic transmission) or in Neutral (manual transmission), with the handbrake (emergency brake) applied and then turn the engine ON. Measure the voltage across the car battery terminals. It should be in the range 13.8V - 14.2V DC.
Be careful when you do this as the engine is running
If it is below the low reading then there is a problem with the alternator or belt.
If you don't have a DMM or access to one (do you know anyone who might have one?) then take your car to an auto electrician to have it checked out.
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