Re: same problem as greyj
the fusible links for the starting/ignition system come off the starter relay...it's bolted to the firewall just below and inboard of the battery...on mine, the links looked like a big, fat (3/8" across, 1 inch long) black rubber thing around the wire...grab the green bit below that which goes to the starter relay...good wire has a particular feel to it - kind of stiff, a bit of girth...if the wires feel soft and really flexy (like there's nothing but insulation) they're probably shot...
now, the important part...figure out why it's shot! it could just be old and worn out - we ARE looking at 15 year old vehicles here...in my case, there was a short under the dash...when we plugged stuff back in (without repairing the short, we saw smoke pouring quite angrily out from the wiring harness both under the hood and under the dash...
after repairing the fusible links, take the plugs out of the ignition switch, and check for continuity between the wires and a good ground (bolts on the firewall, bare metal under the dash, etc...in particular, check the 10ga red wire, and the double yellow wire (2 wires which go into 1 connector)...my yellows were shorted out...i know that because they are the most damaged/melted, indicating they had the most power...you don't want to have any continuity between these and ground...