Dashboard Lights and Gauges
Chevy Blazer S-10
Ford Explorer Sport

Why do your auto 4wd lights all light up on dash no soft or hard codes?

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Wiki User
July 07, 2013 11:40PM

Im assuming these turn of after startup. When the alternator isn't running, these lights automatically come on. Your alternator doesn't start running until your car is running, because it is run by a belt from your engine. So, if your lights stay on after startup, either you have a snapped alternator belt or your alternator is buggered. We had our alternator belt snap the other day while we were driving down a hill, it was quite a scary experience as we didn't know what was going on and in automatics the breaks barely work without the alternater running.