get a heavy duty diesel battery
will be about £50-£80 from motor factors! long as it fits in the tray you will be ok
Lights dimming - upgrade your engine bay earth wires!
Alt to battery
Engine to chassis
Battery to Chassis
Made a massive difference on mine!
i used 4awg throughout
edit - decent ones here
http://shop.ebay.co.uk/items/_W0QQ_d...tery&_osacat=0