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Personally, I like to begin by running power directly to the offending electrical device. Secondly, I run a new ground as well.
This tells you if the headlight ( Or whatever ) is good or not. It also tells you if the problem is on the power or ground side of the circuit.
You do have to be careful not to touch a hot wire to anything!
I carry several lengths of wire with alligator clip ends or various terminals. I also carry a handful of crimp terminals and a crimping tool. One can even insert a fuse by cutting a wire in half, adding two spade females and joining them with a new type fuse.
If you suspect a switch - like your foot switch - you can bypass the switch with a piece of wire and eliminate the switch.
This takes a minimum of equipment and can be helpful if you are away from home.
For instance - your failed headlights - if you are stuck, you could run power to each low beam and drive home like that!
This crude technique bypasses the light switch, the foot switch, the fuse box and all other wires and connections.
I recommend that you pick up a Lucas Fault Manual - some are available for specific cars of your car's age - I have a generic one. The manual can show you how to check every little bitty part of common auto electrical circuits.
Who better to help you find a fault than Lucas?
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'96 855R,'64 PV544 driver, '67 P1800 basket case, '72 Yamaha Rd400, '68 Honda 350-4, '12 XC70, the first 5 are mine, heh, heh, 525,000 miles put on 10 bricks James A Sousa
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