The 70 Coronet requires removal of the windshield to remove the dash. Having purchased a painted rolling shell with the front and rear glass previously installed, the dash completely gutted of its components, I did what real men do: Leave the new windshield in and lay on my back on the floorboards of the car for days on end rewiring it and reinstalling everything while looking at it upside down, doing much of the work by feel. Opting to go with the American Autowire Highway 15 wiring kit rather than a reproduction harness added to the challenge which included designing subharnesses by hand. I even kept the bulkhead connector! In the end it was well worth the effort and achy back.
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