WIRE HARNESSES

If I am making a very detailed model, I must add the wires.........personally, I use successfully surgical sutures................for instance, for the ignition wires, I use surgical nylon (black) caliber 3-0.........................

Bust open an old radio or something electrical( unplug it first!) all kinds of goodies inside! Different guages, colors etc. Or you could buy premaid distributor caps and what not.

The car club guys can be a great help. The ones I have met have been very helpful. Those cars are their hobby and they understand that research is some times necessary.

Deano, wiring harnesses can be made from heaps of different things - wire from multi-strand electrical cable, micro solder, fishing line, lead thread used in fly tying, heaps of different sources.
There's also quite a number of companies that male correctly "scaled" insulated wires in different colors for spark plug leads and the like.
Also, electronics supply stores that sell electronic components often have heaps of different thicknesses of colored wire (insulated or not) to chose from.
As far as knowing where stuff is supposed to go, the best thing is to have a look at the real item - if it's a 1967 Corvette for example, and you don't know where one is, try asking a member of your local Corvette owners club (they're out there, believe me - look in the yellow pages under clubs) for assistance - they're often thrilled at seeing a miniature of a car that they own, and are often very helpful. Give it a try.
Cheers, Tree

If you are entering conteset in a class other than box stock, yes, the more detail the better, otherwise build the level of detail you enjoy, a box stock kit can be just as cool as a detailed to the max model.
Lee

DEANO, I have used bronze phosphor wire to make sparkplug wires (available from model RR dealers). It comes in very small diameters......The idea of a whole harness.......hmmmmmm......gets one to thinking!