I am very mechanically minded and do all the work on my cars myself, however, I am by no means electrically minded and electrics have always been the bane of my life. Over the past month I have removed the old dash from my Magnum Cobra, built a new dash with new layout and a couple of replacement gauges.

During the process of removing the old dash I labeled all the wires as they came off the gauges with the plan of simply reconnecting them as they were before. This evening I completed putting the gauges into the new dash and reconnected the wires as they were removed. Once all connected I turned the key - fuel pump started, ignition light came on, amp meter worked. I then thought I'd test everything in stages - turned on the side lights, no problem but once I turned on the headlights all electrical power stopped. No fuel pump running, no ignition light, no nothing!

I have checked all the fuses, nothing. Could someone please suggest where I should start the investigation.

Thanks in advance from an electrical numpty!