My 2007 Chevy Silverado one ton headlights don't work you can hold the high beams back and they'll stay on but the second you like to go you have no lights at allany idea what's wrong is it a fuse ?

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My high beams won't go off!! - Monte Carlo Forum - Monte Carlo ...

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Jun 8, 2012 - i flipped on the high beams last night and i think that switch in the column broke. ... My high beams won't go off! ... 2003 Chevrolet Monte Carlo. Help!! Need to get headlights working. - Monte Carlo Forum ...
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Light switch faulty looks like,

In the driver side under the dash board ther is light control unit check that

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/paul_0aa451e2c4466dbf

It can be issue with headlight switch,but as its already been replaced.Try disconnecting high beam headlight wiring from headlight assembly and reconnect direct external wire from headlight switch to headlight assembly,then by switch see if headlight is getting off and turning on or not.
See below related help links,similar to your issue.Click the link below:----
Only high beams work but head lights not working on Ford F350?

http://howtobyme.blogspot.com/2011/11/only-high-beams-work-but-head-lights.html

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Only high beams working on GMC Savana?---------- High beams stopped working but headlights still work? http://howtobyme.blogspot.com/2011/11/highbeams-stopped-working-but.html
---------- • Working of Headlight switch? ----------

• Both headlight bulbs blow together? ----------

• Car headlight bulbs don't last long?
------------ Only one head light works on 2001 Dodge Caravan? http://howtobyme.blogspot.com/2011/11/only-one-head-light-works-on-2001-dodge.html

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these will help.
Thanks.

Time for a rebuild

It is possible both low beams are out and you didn't notice until the second one failed. Have you tried to reset the lights with the dashboard switch?

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.

Headlight switch on dash???

dimmer switch has gone bad need to change your dimmerswitch