Under dash work on a '66 ( was Re: IML: Waking a sleeping Imperial)

Under dash work is no picnic on a '66. If you are into some serious troubleshooting and need to do more than one thing, I have three suggestions. One, remove the dash pad. This is not for the faint of heart, as it requires delicate removal and reinstallation of 40-year-old leather glued to 40-year-old foam. You must be very careful not to bend or crack it. Once you do it, you have unfettered access from above AND you can see what you're doing because it's not pitch black under there. Two, remove the front seat(s) and the seat mounting brackets. While they are heavy, they come out pretty easily if you can find the "stud nuts" referred to in the FSM. Those are under the car and attached to bolts that go through the floor pan holding the seat mounting brackets to the car. Once you do that you can move about the car without contorting yourself into a pretzel. Three, remove the instrument panel. Then you can see everything and get your fingers into those tight spots. All of this is documented in the FSM and takes about three hours with common hand tools if you're being careful. This would be a very good time to clean all of the electrical connectors including the bulkhead connector on both sides of the firewall to help prevent future fires.