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Alternator Quick Check

Check the voltage from the alternator to the voltage rectifier, with the engine running at operating speed you should get around 35 - 40 volts AC (depends on engine rpm's) if not then the alternator may be bad, if this checks out then check the output voltage from the regulator it should be 13-14 volts dc. if not then rectifier/regulator is probably bad.

There are sometimes a fuse in the charging circuit, make sure it's good if there is one there.
 
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