[LX5liter]

I'm working on a friends car and am a little stumped. The car(1988 Mustang 4 cyl.) runs fine when it is warm outside, but as soon as it gets below zero, (and it does get cold A LOT up here) the fuel pump will not run. Does anybody have a decent schematic that says where the wire from the inertia switch goes? I know one goes to the relay, but I can't tell where the other one goes. I figure there must be a broken wire in the harness somewhere, and since copper shrinks when it gets cold, it is cutting out the power to the inertia switch, since there is no power at the inertia switch when it is cold out. What do you guys think?