Tuff Stuff 7140FBUL6G12 GM 140 Amp Alternator, Black

The Tuff Stuff 7140FBUL6G12 steps up to a 140-amp output, done in a stealth black powder coat rather than chrome or polish, and wired for OEM or 1-wire hookup on the same 10SI-style case as the brand's other Silver Bullet units.

Fitment to confirm

Model years 1982 to 1990 are covered for this SKU, across Buick, Chevrolet, GMC, Oldsmobile and Pontiac pickups and cars, Jeep, the Wrangler YJ among them, and American Motors models built on that shared case. V6 and V8 GM engines are included, as are the L4 and L6 engines Jeep and AMC used on this platform. Since coverage isn't identical year to year, verify the fit against your particular year, make, model and engine first.

Mounting

The pulley has 6 grooves, the case runs 4.85 in. deep, the lower mount boss is 2 in. long, and it's clocked to 12 o'clock; confirm that position suits your bracket. Electrically, it's built for a 12-volt, negative-ground setup.

Condition

A black-finished, higher-output unit made from 100% new parts, with a one-year limited warranty, for setups that have outgrown a stock-amperage alternator.