Fault phenomenon: the car in the closed ignition switch, instrument display is normal, but the charging indicator light is not bright, and the ignition switch is placed in the second file (starter) when the starter no reaction.
Troubleshooting: check the charging indicator light, the charging indicator light is displayed. Because the charging indicator lamp is controlled by the combined relay, the relay is removed to check, and the problem is not found.
According to the Baotou beiben vehicle accessories combination relay circuit wiring diagram shows that the closure of the engine is not running under the condition of Baotou beiben parts ignition switch I or II file when the charging indicator light will shine due to electricity, the current from the battery cathode, ignition switch, charging indicator, ground relay normally closed contact the charge indicator lamp, the combination of relay. The charging indicator light does not shine after the ignition switch is closed, and it is believed that the normally closed contact of the charging indicator relay is caused by the analysis.
The power supply terminal of the charging indicator relay is connected with the IG connecting rod of the AC generator, so the decomposition of the AC generator is removed, and it is found that a diode of the alternator has a breakdown short circuit on the rectifying plate. After replacing the diode, troubleshooting.
A diode short circuit breakdown on the AC generator is rectifying plate, the battery current will by an AC generator B+ is connected to the diode, short column alternator, IG column, the charging indicator relay coil to ground, the charging indicator relay action, suction opening its normally closed contact, so as to cut off the ground charging circuit the lights and cut off the ground loop starting relay, so the fault will appear when the ignition switch is closed.
Needs to be pointed out is that the diode short circuit breakdown is because the car driver mistakenly put battery reverse polarity, resulting in Baotou beiben accessories battery current in no load condition through the alternator rectifier diode caused.