Yes I've made my own looms. It's easy enough. For circuit capacities you don't have to measure the resistance of the circuit as the resistance of the actual wiring is negligable if the correct size has been used. You just have to add up the power usage of every item on the circuit, work out the current needed in the circuit, choose wiring of the right size and then use a fuse that has a continuous rating that is higher than needed but not too high. Various people among the suppliers listed above mae very good fuse boards. There's a lot of design work involved to do it properly but once it's done you'll have good reliable wires. Designing the earth system is just as important, remember that the earth current all adds up too, don't use skinny earth wire everywhere! And try to stick to the threee standard main earth points for everything.
I would also add Auto Electrical Supplies to the above list and a couple of American Hot-Rod companies for some more interesting and useful little bits and pieces. Places like Centech and Ron Francis Wire Works.
The correct colours to use for everything are listed as a British Standard, you should be able to find it if you search. It's BS-AU7. Most of it is also in the back of the Haynes Electrical and Electronic Systems Manual, which you might want to invest in for this project. There are a couple of books about wiring kit cars out there but I would avoid those as they deal in very basic terms, kit cars generally not having much electrical equipment. The Haynes book deals with some of the legal requirements and how systems like the wiper self parking and dim-dip lighting work as well as basic wiring practise. I found it useful anyhow.
Oh and don't wrap it all in electrical tape! Get some proper non-adhesive loom tape to hold it together.
And if you can, use thinwall cable. It makes the loom a lot smaller.
Edited by Dan, 12 June 2007 - 04:02 PM.
