13.5volts at idle with 250amp alternator normal?

when i start mine up cold it idles at 14.3-14.7. After warming up it drives at 13.8-14.2 depending on whats going on. 13.8 would be hot after playing full tilt with headlight etc. Idle full tilt with gear in sig it can drop to 13... running at decent rpm it drops to 13.6 at full tilt with heavy *** bass.

This is usually taken with the voltmeter on my deck as well... but also tested with a dmm. The deck readings are actually fairly accurate.... off by maybe .1 volt at most.

 
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