1968 Mustang Wiring Diagrams : Evolving Software 1968 Mustang Wiring Diagrams. Created this diagram from bits and pieces hidden all around the internet so I thought I’d republish it here all in one place. Download PDF. 1968 Master Wiring Diagram . E20 – NEUTRAL SWITCH . E19 – CONVENIENCE SYSTEMS . E18 – TILT WHEEL . E17 – SPEED CONTROL . E16 – SPEED CONTROL . 1968 Mustang Wiring Diagrams and Vacuum Schematics 1968 Mustang Wiring Diagrams and Vacuum Schematics January 29, 2015 Mustang Wiring and Vacuum Diagrams AverageJoe On this page is a list of areas covered by the 1968 Mustang wiring and vacuum diagrams; scroll down the page to see the diagram image gallery’s for both. 68 Mustang Master Wiring Diagram - Mustang Fuse & Wiring 68 Mustang Master Wiring Diagram plus Image Locate identify which fuse or relay is blown it may be located under dash under hood in trunk find the fuse for the radio tail light cigarette lighter blinker ac horn. This Diagram is for a 1968 Ford Mustang and show the master wiring. Don’t Do It: Top 12 Wiring Mistakes The Ignitor must have 12 to 14 volts to perform as designed. When you use your Mustang’s factory resistor wire, which was designed for your factory ignition coil and point-triggered ignition, the Pertronix Ignitor won’t get enough current to function properly. Another mistake we see, and have made, is proper grounding of the Ignitor module.