2001 silverado. My headlights will not come on but all other lights will. all fuses and relays are fine all connections are fine and i replace the headlight switch and multifunction switch. any ideas?

Check the tail light bulbs & marker light bulbs.

Replace the headlight sw. on the dash and see if that fixes it.

Look for the RELAYS for the lights. They are usually on the fuse box. Replace the headlight relay.

-Check "headLight fuse"
-Check connector at the headlight.
-Check the bulb. (It could burn out)

Mai

You have a bad ground by the lamp fixture. You grounded the circuit and completed it with the wire to car body.

Check all over the lamps for corrosion

check fuse and connections if that is good the wire has is bad !

I had a similar problem on my 2001 Caravan. Turned out to be a loose connection between the frame control module and the fuse box. I unscrewed the frame/front control module from the fuse box and bent the tabs slightly to make better contact. Then tighten down the module securley. Need star driver to loosen screws

change the headlight switch!! itself its broken inside the unner contacts

Hi. That sounds like the Low/high beam switch is malfunctioning and in need of replacement. I believe this because the headlights will not come on no matter which power source is attempting to activate them. Clearly, they are not getting power. Since the high-beam indicator light is functioning and indicating HIGH BEAM it IS getting power, There is no further interruptions in that circuit, save the fuse. IF the fuse is good,.. tested good.... Then the switch is bad, if the fuse is bad... replace it. If this doesn't solve the problem You have blown all your headlights simultaneously, or lost all the connectors to the headlights all at once, or possible got so unlucky as to lose all connectivity to just the headlights magically. I'd bet the fuse if I didn't believe that you would have checked that before posting the question here, and that doesn't account for the indicator to be stuck, so.... This pretty much leaves the switch ol buddy, sorry.

check the ground on the lights.