Oldest they list one for is 89 though.
That doesn`t mater, its the same alternator thats in you 86, it will bolt in and the plugs (wiring) are the same. I plan on buying one for my 86 4Runner soon.
![](https://board.marlincrawler.com/Themes/MCI_V3C/images/ip.gif)
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86 4Runner
Solid Axle Swap, 5'' Of Lift, 37x12.50-15 MTR Tires, 5 Speed Manual Swap, Inchworm Duel Cases With 5.7 Gears, 63'' Chevy Springs In The Rear, 5''Trail Gear Springs In Front, Marlin Crawler Third Members, 4.88 Gears With A Detroit In The Rear, High Pinion Front With 4.88 Gears and an ARB, Downey Header, Optima Battery, Trail Gear Sliders.