Quote:
Originally Posted by 4x4junkie
normally the speratic reading would lead me to the voltage regulator built into the altornator, however i have a 2000 silverado 2500 LT 4x4 with 6.0 vortec equipped with the optional dual battery installation and it fluctuates between 14 and 16 volts depending on engine rpm ...... i however cannot say this is normal for these trucks ...... but mine has had that fluctuation ever since i bought it.
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the only time the voltage will be not at the 14volt region would be when cold start in cold weather..if the temp was 10deg f on the first start at this temp the voltage will be 15.5volts. after the alternator heats up this will drop to the 14 volt area......
on a hot start arizona 115 deg f this voltage may be 13.25volts. this is all about the voltage regulator temperature control...
with a steady operating temp this voltage should not vary with RPM .....if so I would say the diodes are damaged, this would cause a half wave output which will give the alternator a voltage fluctuation with rpm changes.