what amp/hour rating battery did you fit? have you cleaned all the multiple feeds that come off thge battery positive into that black fuse bank ? i found corroded wires there on mine and loose connections and with a rusty main body earth to the inner wing and oilg grubby earth to the gearbox for the starter - all this didnt hekp - i also had to replace all my multiplug connectors behind the headlight by soldering them and heatshrinking them through.