如果拖拉机两只前大灯虽一只亮些,一只暗些,但并无明显差别,这属正常现象。因为两只大灯内的线路长短、接头与搭铁的可靠程度均有所不同,线路电阻并不一样,通过的电流大小也就略有差别了。若一只大灯亮度足够,而另一只大灯灯光明显发暗,则灯光发暗的灯泡很可能搭铁不良。因为前大 If the two tractor headlights although a bright one, a dark, but no significant difference, this is normal. Because the length of the two headlamps in the line, the reliability of the connection and the ground are different, the line resistance is not the same, the current through the size will be slightly different. If a headlamp is bright enough, while the other headlamps light significantly darker, the darker light bulb is likely to take the wrong side. Because before the big