B. Light source (pressure-reducing controller):
Make sure that the light source is several series of parallel, three series of 12V system, six series of 24V system; connect the light source directly to the accumulator for a few seconds (under the normal voltage of the accumulator), determine if the light source is normal; the light source is not bright, check the connection of the light source is not problem: whether the line is loose, whether the positive and negative poles of the light source are in opposite direction;When the positive and negative poles of the light source are not connected in opposite direction and the line is not loose, the light source directly connected to the accumulator is not bright, so change the light source.
