I just put some white face gauges in my car splicing in on the light switch's power wire. The back lighting on the guages work, but I lost headlights. Still have fog/turn signal lights but no headlights. The fuse is good to.

 

i thinkin tthe splice box cut the wire and does not complete its circuit?

 

Recheck all of your wiring connections. If all else fails, remove the wires that power up the new guage faces and start over again with the installation. Sounds like a bad connection in the original installation.