I've got a '90 k5 350 TBI, and am concerned about the reading I'm getting from the voltmeter. It reads anywhere from 8 to 13 volts. Every other vehicle I've ever owned always hung out around 13 volts. My Blazer is at 8 more than it is at 13. I had the alternator checked, and it read a consistent 13.8 volts while at the same time the voltmeter was reading 8. Am I just paranoid, or do I have an electrical problem? The vehicle runs just fine otherwise.