For some reason on my truck the headlight is not working. The high beam is working fine but my low beam don’t work what so ever. Can some one help me what to look for or what to replace?

 

I'd start by replacing the low beams.........

Have you verified that the low beam elements are good?. Use an ohm meter.
If so then use a volt meter or lighted test tool to check for 12VDC at the connector.
If no voltage there then check at the light switch.

Also please state your year, model and engine size.

 

Sorry my truck is a 1977 Ford F-150. The low and high beams are one unit. I will check it out with the volt meter. Thanks!

 

Try your dimmer switch. Mine done the exact same thing. Its like $5 and only takes a minute. Also could be a relay.

 

Thanks I will check it out!