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check the battery cable for a good connection then make sure its in park move the gear shifter around and place back in park. check the head lights for full power. last thing is jump it with cables to make sure the battery is strong.
Get a wiring harness connector for your 1998 GM car - THEN carefully follow each wire color on the harness. Do NOT connect anything to the GM orange wire except "Memory". Do NOT connect anthing to the harness for "Lights" or "Dash" or "DIM" - you will blow fuses. Only connect the Power, the memory and the speakers - period. Then you'll be safe.
Further test showed that the interior (dome) and exterior light
flickered only while driving. The problem was that the battery rack is
broken. The battery negative terminal connect to the motor (OK) but
also to the frame of the car through the battery rack. Since that rack
is broken, the grounding of the car was intermittent. Whenever I
shifted, it made the motor move in relation to the frame of the car, so
that's why is caused all the light to turn on in the dash.