After the battery reverse polarity circuit fault caused by
Symptom: an Isuzu car ignition switch is closed, the meter displays the normal, but the charging indicator does not light, and the ignition switch to Ⅱ file (start-file) when the starter did not respond.
Troubleshooting: Check the charge indicator, charging indicator shows normal. Because the charging light by the combination of car relay control, so the combination of relay and remove the check, also found no problems.
Combination with reference to the car wiring diagram shows the relay circuit, in the case of the engine is not running the ignition switch I closed file or Ⅱ file, the charging indicator light will be energized and illuminated by its current from the battery positive charge → → Ignition Switch LED charging indicator relay → portfolio normally closed relay contacts → Ground. After the ignition switch in the closed car charging indicator does not light, the analysis indicates that the charge should be normally closed relay contacts caused by the disconnect, so suspect at this time charging indicator relay power terminal voltage. The car charging indicator relay power AC generator in the IG received termination pillar, so decomposition of removing the alternator checked, then found that the alternator is a diode rectifier panel has short-circuit breakdown. Replace diode, troubleshooting.
Alternator rectifier board is a breakdown diode circuit, the battery current from the alternator armature will then column B + → → The alternator diode circuit, IG then charging indicator column → → Ground relay coil, so that charging indicator relay energized action, suction opening its normally closed contact, which not only cut off the charging indicator and cut off the Ground Loop Ground loop starting relays, so there will be closed when the ignition switch to the aforementioned problems.
Should be pointed out: the diode breakdown because the car driver short-circuit the battery had mistakenly reversed polarity, resulting in the battery without any load current flowing through the case of alternator rectifier diode caused.
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