Product Summary

One Wire Alternator, V-Belt Belt Type, Natural

  • It is a 12V alternator with a negative ground
  • This alternator has a stock looking GM 10SI case
  • Comes with a V groove pulley and has an internal regulator
  • It puts out 140 amps of current and is a simple 1 wire hookup
  • Features a low idle cut-in internal regulator and provides plenty of charging at low RPMs

Key Specs

MFG. Part #7127K
BrandTuff Stuff

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All Tuff Stuff alternators are hand built in Cleveland, Ohio and are tested to meet or exceed OEM specifications. All Tuff Stuff alternators are made from 100% new components and carry a one year limited warranty.

Tuff Stuff has alternator applications for virtually all muscle cars, hot rods, customs and light trucks in just about every finish imaginable. Many enthusiasts prefer our clean, simple 1-wire alternator option which features a low idle cut-in internal regulator and provides plenty of charging at low RPMs. Available in chrome plated, polished aluminum, powder coated and plain as cast finishes. All alternators are for 12 volt, negative ground systems, except where noted.

  • Alternator
  • 140 AMP
  • OEM Or 1 Wire
  • V Groove Pulley
  • Internal Regulator
  • As Cast


Diagram (PDF)


MFG. Part #7127K
BrandTuff Stuff
One Wire AlternatorYes
Belt TypeV-Belt
Alternator Case StyleGM 10SI
Alternator Amperage140 amp
Voltage Required12-Volt
Alternator FinishNatural
Alternator Pulley IncludedYes
Alternator Brackets IncludedNo
Sold in QuantityEach
GTIN Code698252015639
Belt IncludedNo
Pulley StyleV-belt
Regulator StyleInternal
Regulator IncludedYes