Please make sure that it is routed the right way and for that year vehicle.
If you have a 66-86, anything with v-belts, or a 87-98 300 (4.9L) or 460 (7.5L): you'll need a Pivot Mount w/ 8.25” ear spacing alternator. Some 90, any 91-92, and some 93-99 non DOHC Ford Taurus will be able to donate it's alternator to your truck. On your v-belt truck, you may also be able to use one that fits the 87-92 serpentine setup (Pivot Mount w/ 7.00” ear spacing) but some may have fitment issues with smog pump location.
A wide-eared Taurus alt will ONLY fit a 302 or 351W if it is a V-belt setup since it's wider than a serpentine one. If you have an 87-92 302 (5.0L) or 351W (5.8L): you have a 2G alternator. This is an early serpentine style.
This can only be replaced with a Pivot Mount w/ 7.00” ear spacing alternator. Minor bracket clearancing may be required. 91-94 V6 Lincoln Continental.
The early serpentine car and truck alts on Ryan's site are interchangable but the plug and charge stud are clocked differently to fit the wiring to the bracket better. If you have a 93-96 302 (5.0L) or 351W (5.8L): you have a Side Mount 3G already but a 95 amp one. You DO NOT need to get a wiring harness, as since you already have a 3G, it's plug and play!