UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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I think you need to have the battery and charging system tested. Most likely though is you just need a new battery.
Any problem you may have created by replacing the fuse incorrectly would have shown within a day or two. Not 2 - 3 weeks.
Thats reassuring. I do not have any experience with cars other than changing a bulb or a fuse or a tyre. My wife needs the car tomorrow so I need a quick fix and will probably justchange the battery if you think that woul be the best option.
I would make sure the alternator was charging first. Simple test with a multimeter. Looking for around 14 volts. If charging ok then replace the battery.
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Thank you again.