Alternator & Regulator - Models W/External Fan: Description
The Motorcraft Integral Alternator-Regulator (IAR) system with external fan has an electronic voltage regulator mounted on the rear side of the alternator. Current is supplied from alternator/regulator system to rotating field of alternator through 2 brushes contacting 2 slip rings. Alternating current is rectified to direct current by 6 diodes. See Fig 1 and Figure .
Some models are optionally equipped. See appropriate ALTERNATOR article in this section listed below.