Dallas Mustang's Speedcal installation instructions are pretty straightforward for someone installing a new Speedcal in an unmodified Mustang, but if either the Speedcal and/or car wiring has been hacked up, it isn't very clear as to how things should be wired. As a result, I get a number of calls from people trying to clean up Speedcal wiring messes.
To make it easier, I have drawn a wiring diagram that shows how to wire a Speedcal into a 94-04 Mustang:
To make it easier, I have drawn a wiring diagram that shows how to wire a Speedcal into a 94-04 Mustang:
