[pgarner]

give it a go and see if it helps
like a say my music wasnt cutting out but the screen was flashing on and off. if the lights were on as well you could see them dulling down as well. there was too much of a drain on the alternator / battery

i think you should be looking for 1 farad for every 500w. so the 1.3 will cover the 400w amp as its rarely going to be at full whack all the time. mines is a bit of overkill but i was only paid £30 off ebay for it