2011 Cadillac STS Alternators

Genuine GM alternators for the 2011 Cadillac STS, at wholesale prices. Alternator output rating varies by electrical load, so a truck with a tow package or upfit wiring takes a different unit. Sigma platform rear-drive sedan, offered with the Northstar V8 and in supercharged STS-V form.

When to replace

A battery light, dimming headlights at idle, or a no-start after a short drive. On a full-size car, engine option is the main split here, and it runs deeper into the group than most people expect.

What you get ordering from us

• Factory sourced. These alternators are built to GM's own drawing by the supplier GM contracted.
• No guessing. Our VIN lookup resolves the near-identical alternators numbers for you.
• Ships from Dallas. Alternators ordered by 3pm Central go out the same business day.
• Straightforward returns. No restocking games on alternators that did not fit.

Avoiding the wrong part

Aftermarket versions are often close enough to install and far enough off to cause a repeat repair. Option packages divide this catalog more than model years do. Send the VIN and skip the problem. Our Dallas location means most of the country is inside a two or three day ground window.