66 Under Dash Wiring Help | Mustang Forums at StangNet I need some help from a wiring guru on a 66 convertible, standard interior. For my wiring, I was fortunate enough (note sarcasm) to have to replace the entire cowl assembly allowing perfect access to replace all the under dash wiring. Even though I have numerous wiring diagrams, I laid the new.. 1966 Mustang Wiring Diagrams - Average Joe Restoration 1966 Mustang Wiring Diagrams. March 10, 2014 Mustang Wiring and This diagram´s was very helpful they make my day (and this night to) Best regards! Anders From Sweden. Reply. john says: December 13, 2015 at 6:15 pm just got a 66 keep plowing the top fuse as soon as key turns on heater lights all work except for the dash lights any 1966 Mustang Restoration - Underdash Wiring Harness - YouTube Click to view on Bing4:111966 Mustang Restoration - Underdash Wiring Harness jevchance. Loading '65 Mustang dash disassembly Autorestomod Episode 122 Episode 5 Season 2 wiring harness and dash final assemblyAuthor: jevchanceViews: 30K 1966 Mustang Under Dash Wiring Diagram | Diagram 1966 Mustang Under Dash Wiring Diagram. Posted on December 2, 2011 by admin. Click to enlarge view the care and feeding of ponies 1965 1966 mustang turn signal switch wiring 1968 mustang fuse box wiring diagrams 67 camaro diagram free 66 1967 cougar 69 1969 1966 mustang wiring diagrams.