This what you do-get a voltmeter follow intructions on it. Now read the battery voltage before you start it-record it-NOTE: it should be atleast 12.5volts or better. Now start it up-load the electrical system by turning On the headlights/heater on high-record the reading-it should read between 13.5 -15volts if the regulator doing its job. Required voltage not to specification. Double check all connections at battery and alternator. On some vehicles the computer controls the regulator to increase and decrease resistances to meet the charging system demands.
Removing a battery cable while engine in operation will produce an uncontrollable voltages that can harm the alternator. I strongly recommend that you get the alternator load tested
Tuesday, September 18th, 2007 AT 6:51 PM