Hi, I've got a Renault Clio 182 2004, with 77k miles and today the electrics started tripping out whilst driving to work. The radio, fans and lights would go off then come back on again after approx. 10 seconds. The dash would light up like a Christmas tree. I noticed tonight when I went to pick a takeaway up that when slowing down, that after braking for a few seconds the battery warning light would be lit. I'd stop at junction etc, then pull away and light would go out. The car has been serviced recently, new oil, filters, spark plugs, ht cables and coil pack, all oem. The battery is less than 6 months old. Is it my alternator? How do I check?