Your alt or charge indicator light comes on your engine is hard to start and cranks slowly or doesnt crank your battery demands lots of water your alternator makes noises or your headlights suddenly go dim these and other problems may be caused by a fault in the charging system before you . Charging system troubleshooting there are many possible ways in which the charging system can malfunction often the source of a problem is difficult to diagnose requiring special equipment and a good deal of experience. If there is any interruption in the normal cycle between low and high voltage repair the wire where wiggling interrupted the voltage cycle if there is no interruption in the normal cycle between low and high voltage with the scan tool read trouble codes and perform dtc test if there are any charging system trouble codes. Tech tip troubleshooting the alternator charging system august 01 2013 categories tech tips troubleshoot using the service manual if youve passed through the first four steps then the alternator is working as designed and your problem is likely caused by something external to the alternator
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