2010 GMC Sierra 2500 HD Alternators

Genuine GM alternators for the 2010 GMC Sierra 2500 HD, at wholesale prices. Alternator output rating varies by electrical load, so a truck with a tow package or upfit wiring takes a different unit. GMT900 HD through 2014, K2XX HD from 2015 to 2019, and the T1XX HD from 2020.

When you need them

A battery light, dimming headlights at idle, or a no-start after a short drive. On a heavy duty pickup, cab configuration, drivetrain and box length all split this group, so the badge on the tailgate is not enough to order from.

The case for genuine GM

• 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.
• GM stands behind it. The alternators warranty comes from the manufacturer, not from us.

Getting the right part

When a component is superseded, GM documents why. That history is worth having when something failed early. Two vehicles off the same line in the same week can take different parts. The VIN is how we tell. Most orders leave the same day. Oversized and freight items take an extra day to crate.