The Tuff Stuff 7127D9 is a 100 amp GM alternator on the Factory Cast PLUS platform with an internal regulator and a 12V, 1-wire self-exciting circuit. It uses a single V-belt pulley and an as-cast natural aluminum case.
- Type: Alternator, Factory Cast PLUS
- Output: 100 amps, 12V
- Wiring: 1-wire self-exciting, internal regulator
- Pulley: single V-belt
- Case: aluminum, as-cast natural finish
- Application: GM
- Part number: 7127D9
FAQ
Does the 7127D9 have an internal regulator?
Yes. The voltage regulator is built into the alternator.
What is the amperage rating?
It is rated at 100 amps at 12 volts.
What does as-cast mean?
As-cast refers to the natural cast aluminum finish left on the case.

