I bought a disco 1 td5 off road ready a couple of nights ago, most of the electrics have been bypassed including the ignition as you have to push a button to start it. It conked out after driving for about 20 mins, started off a jump fine and that died again about 20 min later and will not start at all even with a jump. Can anyway help point me towards the right direction as I don’t have a clue where to start