Question about 1999 GMC Denali
The first thing to check is the headlight switch, they will go bad and keep lights on,also i dont know how long youve own this truck but theres and auto setting on switch and the lights come on even with the swith off at dusk,and also there are driving lights that are on all the time,if you turn key off and they stay on for more than 2 mins, then check the switch,if you mean there on every time you start it ,even during the day, then the sensor on the dash may be bad or you may have something cover it and it thinks its dark out and turning on the lights.
Posted on Jun 01, 2010
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Posted on Jan 02, 2017
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