Theres a fuse, called DRL, if that's missing or blown, or if the parking brake is depressed a tiny bit, they wont come on.
You need to periodically replace the headlights on your Chevy truck when the headlights start getting dim. You can purchase replacement headlights from retailers such as Parts Source.
It is supposed too.
This sounds like a battery that isn't putting out it's full load of cranking amps anymore. However, when you turn the key to "start" a relay should automatically turn off all of your electrical devices. So I would start there with the starter relay.
the starter,battery and the alternator are good,icheck and change the the wires but the light inside the dashboard,the headlights come on but the truck will not start.
Sounds like the battery went dead or you have loose/dirty battery connections.
Whatever controls the relay must be broken, if everything beyond the relay works.
Yes
even if you disconnect the battery the headlights stay on????????????? check the headlight switch
Not sure on the disconnect part, but after you start the truck, push your dome light on and off 4 times, you will hear it chime, the daytime running lights will then be out. But you gotta do it each time you start the vehicle....
Park on a level surface and measure and mark 25ft. forward of the truck. Wait for condition of low light. Start the truck's engine and turn the headlights on, set to LO beam. Adjust the headlights so that the brightest part of each beam hits the ground 25 ft directly ahead of the lens (not to the left or right.) You may need a #2 Phillips head screwdriver to turn the adjusters.
There are many online retailers that stock replacement bulbs for Chevy truck headlights. You can purchase such an item from sites such as AutoAnything, Amazon and Auto Zone.
If there are not "short's to ground", you probably have a faulty circuit breaker for the headlights.