Voltage fluctuation problem

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February 4th, 2013, 7:29 PM

jpmoore70

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Voltage fluctuation problem

I have an 06' Trailblazer that I recently purchased. I am troubleshooting a problem with the voltage fluctuating. The gauge will fluctuate from 14+ to about 12v. This problem ONLY happens when the car reaches normal operating temperature. I have tested the voltage from the alternator while the fluctuation is happening and I get an erratic reading of approx 12-13 volts. After some research I thought it was the voltage regulator so I replaced the alternator, no luck. I am now at the point where I have nothing to troubleshoot. I am new here so let me know if any further information is needed.

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February 4th, 2013, 8:15 PM

kevinkpk

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Not so sure these vehicles use a voltage regulator, but rather a module. Voltage regulator would be the first suspect in my mind. It also could be (very) dirty winding in the alternator. Since you replaced the alternator, I'd suspect the BCM.