I assume this is in regards to your '66 coupe. It helps to know what you're working on.
With respect to cut and damaged wires, it helps to know the color codes of the "mystery" wires since that may be a key to the mess you now have.
You need to make a decision about the harness and whether its worth trying to fix in place or whether its better to remove it to a bench situation where you and better see what you're doing. If you think you have more than a half dozen repairs to make, its probably easier to remove the harness and work on it away from the car.
To proceed below you'll need a shop manual with schematics or one of the cheapie schematics from your local Mustang vendor. You'll also need wiring tools, soldering iron, crimper and Ford bullet male and female connectors (NAPA auto parts).
How to remove it:
Remove glove box liner. Remove instrument panel after looking at the wire locations and comparing them to the schematic. Its important that you understand all the connections and color codes.
Pull out door switches and disconnect male plugs from same. It does not matter which of these males go into the switch. These will be black-red and yellow-green wires if I recall correctly. Do on both doors. Disconnect glove box light. Remove ash tray.
Start from the passenger side and roll back harness towards drivers side. Under hood disconnect the center ignition harness plug...pull on it to release. Also disconnect the lighting harness plug next to the brake master cylinder. Now this is the tricky part. There are four little metal tabs that hold the female side of the plug onto the fire wall sheet metal. You don't want to break these little tabs but you do want to push them inward enough to allow the female plug to release from the firewall. Its hard to get at on the lighting harness next to the fender apron. Be patient!
Once the plugs are released from the firewall go back under dash and peel the harness out through the instrument panel hole. You will have to unscrew a ground that holds the harness to the dash brace on the right side. Disconnect the ignition switch, the cigar lighter, the wiper switch and the headlight switch. You may take these out of the car if you wish for inspection and replacement as necessary. Of four in my car, all four were shot.
Remove the fuse block by unscrewing the two screws that hold it. Disconnect the harness at the brake light switch and the steering column.
Remove the flasher from the air vent tube and peel back the harness into the dash hole. Remove the harness from the dash hole.
Once its out, examine it for visual damage or wires not part of the original harness. If there are extra wires not part of the original assembly...my advice is to discard them unless they are part of an accessory you wish to keep...aftermarket stereo, etc.
Clean up all sockets and lubricate them with electrical paste. Fix any previous owner sins. Restore the harness to factory original configuration. Use the schematics to trace all wires and figure out where each goes and what it does.
This sounds hard but generally its not. It is detailed and does require a bit of brain power. Like any other job you get out of it what you put into it. Usually takes a few hours and the harness starts looking much better. Put back in car in reverse order of removal. Reconnect as you go and double check everything. If you do this, chances are everything will work perfectly. If not, you're left to troubleshoot items not working.
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