When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Single wire literally only has 1 wire to hook up. Where it's bolted is the ground, and you run a single wire from the alt to the positive battery terminal, and the alternator has an internal voltage regulator. When you start the car and the alternator rpm gets high enough, it signals the alternator to switch on and start charging the electrical system. When you shut the engine off and the alternator comes to a stop, the switch shuts off