拖拉机的电气设备,主要是用来照明,起动和点火。点火系统在第二讲里讲过,这里不再重复。照明和起动电气设备的电压都很低,都是6伏特或12伏特。采用低电压的优点是安全,线路绝缘比较容易,缺点是对线路上的接头非常敏感。有些驾驶员不了解这一点,一根电线常常是由许多小段接成,接头很不干净,胡乱拧几下,接不牢。殊不知接 Tractor electrical equipment, mainly used to lighting, starting and ignition. Ignition system talked about in the second talk, not repeat here. Lighting and starting electrical equipment voltage is very low, are 6 volts or 12 volts. Advantages of using low voltage is safe, the line insulation is relatively easy, the disadvantage is that the connector on the line is very sensitive. Some drivers do not understand this, a wire is often made up of many small pieces, the connector is very dirty, random twist a few times, then pick up. I do not know then