Ignition wirng harness

The column mounted switch has a short wiring harness made onto it. So you would buy a new switch with the wires. It connects to the cars harness under the dash. You found white plastic connector with about 5 large gauge wires and possibly 1 smaller orange wire. anyway... This connector would overheat, melt, loose connections. You have only 1 hot at all times wire there. The switch sends that power to the other wires. Aint no way we can tell you which is loosing connection. Power in at fault or power out at fault. We can guess... If you loose everything including the fused accessories at switch on I'll guess the power in is faulty. That wire comes from a weld splice and we have seen it melt all the way to the weld splice, short to other wires it taped in with, etc... If power in is always good, power out on yellow would run the starter even though it doesn't start due to brown or blue faulty.