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HI, driving home tonight i noticed that the lights were going dim then bright, this went on for about 5 minutes until i got home, the fan was on + radio, + lights, how can i tell if it is the battery or the alternator that is at fault?
or would it possibly be something else, i have owned the car for 2 1/2 years & have changed neither battery or alternator.
thanks for any help/advice, gordon.
do you own or have access to a multimeter? you could check the output voltage of the alternator. I would recommend taking your car to halfords or somewhere that does batteries and could load test it to check the condition of it, it should be free of charge in the hope that they can sell you a battery if it fails.
Currently in stef123's garage:
2006 Ford Mondeo ST TDCI