i have a ford mondeo mk 3 , when i start the car its fine but wen i turn heater on and lights it makes a rattling soind , i know its an electrical problem but wat could it be many thanx if u can help

kelvin, February 2010

It could be your alternator struggling? Or not so much struggling, but if its on its way out, it might be more noticeable under strain.

Just a possible.

Open bonnet, then start it up, turn on both the window heaters and all lights and have a listen to the alternator.

Darrell, February 2010