Mike, I think the wire is only so you can not turn the lights on without the key in the ignition, if you want to by pass this then just attach it to any 12 volt source. If you want to get to the ignition (and to under the dash the best way I have found is to remove the upper vent portion of your AC, then remove the corner piece of your dash, it is the part on the very end of the dash corner directly above the AC vent to the left of the steering wheel. It should be held on with 3 screws. Behind that you will find a hole threw the dash/firewall/bulkhead that you can bring wires in and out for switches and it is relatively easy to get to behind the ignition switch from here by removing the gauges.
Don't forget to
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first then ask questions later! The loose nut behind the wheel