I have a 73 mach 1 I had headlights now I dont

I had headlights and dash lights before I started installing my new radio. I used the switched power from the original wiring harness and picked up the main
power feed from the cigarette lighter. The radio works fine but I lost my headlights and insterment panel lights. I checked the 4 amp fuse and there is no power coming to it is this my problem? Should there be power there? Any one have any idea what could be wrong and where I should start looking?
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