Check Engine Light
Chevy Blazer S-10
Chevy Trailblazer

Why would a 1999 Chevrolet S10 Blazer dash gauges and dash lights go nuts and engine run badly?

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Wiki User
March 01, 2008 2:58PM

Had the same problem on two occasions with my 99 Blazer...sounds as though your alternator is going bad. The car will run good while the battery is charged up, but as the battery wears down, the engine will run poorly and the gauges will operate erratically. Eventually, the battery will not have enough energy to allow the engine to run, and it will stall.