Did You Remember To Connect The Ground?
You'll probably laugh at this one, but it happens a lot. There has to be a complete electrical circuit in order for anything to function properly. With automobiles, the steel body is part of the electrical system known as the ground. The negative battery cable "grounds" to the engine block. The engine is grounded to the firewall via a ground strap. The vehicle's wiring harness is grounded to the body as well, which makes your Mustang's body an electrical path. If you don't use an engine-to-firewall ground strap, you're courting electrical gremlins that cannot be explained-the alternator won't charge, lights are dim or won't work at all, and the ignition system works then quits.
Check all of your Mustang's electrical system grounds from bumper to bumper. Any stray black eyelet leads are disconnected grounds. Make sure they're connected.
We're showing a PerTronix Ignitor installation here because we get calls and emails about no-start conditions wi