Parts for your Chevrolet Tahoe
2020 Chevrolet Tahoe Alternators
Buy Chevrolet Tahoe alternators online from 20 units for 1999-2021 SUVs, priced from $56.43 to $341.98. Brands include Pure Energy, AC Delco, Remy, BBB Industries, API and DIY Solutions. Fitment is listed by engine and VIN code, covering the 4.8L, 5.3L, 5.7L, 6.2L and 6.5L engines, with amp ratings and case size where they apply.
Year
More Chevrolet Tahoe parts
Engine and amp rating first
Tahoe alternators change with generation and engine. 1999-2000 GMT400 trucks, 2000-2006, 2007-2014, 2015-2020 and the 2021 redesign each have their own applications. The 2021 Tahoe uses a different engine layout and mount, so treat it separately.
Within a group, match the engine, VIN code and output. Listings here note details such as the 105 amp unit tied to RPO K65 or the 137mm case. Optional electrical equipment can raise the rating. Read your old alternator's label, then compare the plug, main terminal, pulley and mounting holes. Drivetrain and trim rarely change it.
Charging trouble on a Tahoe
Common signs include a battery light, a Service Battery Charging System message on later Tahoes, dim or flickering lights, slow power windows and repeated dead batteries. If the battery drains far enough, the engine can stall.
A whine or grind that rises with engine speed often comes from worn alternator bearings. A squeal is more often the belt, tensioner or an idler pulley. A bad ground, corroded cable or damaged plug can mimic alternator failure and can even kill a new unit, so test the whole circuit first.
Removal and belt checks
Disconnect the negative battery cable first. On most Tahoes, you move the air intake duct, release the serpentine belt tension, unplug the regulator connector and remove the main cable nut. Later models commonly use a 13mm nut on the main terminal and 15mm mounting bolts, but sizes vary by year.
With the belt off, check it and the tensioner and spin each pulley. Make sure the new pulley lines up with the belt before tightening. Never pull a misaligned alternator into place with the bolts. After installation, confirm charging voltage and that the warning clears.
More about alternators
Read our alternators buying guide for how the part works and what to look for in any vehicle.
Tahoe questions
Will a Silverado alternator fit my Tahoe?
Sometimes the same alternator covers both, but not automatically. Engine, amp rating, connector, pulley and mounting must all match. Only buy a unit whose fitment table lists your Tahoe year and engine.
What amp alternator does my Tahoe need?
Check the label on your old alternator and the RPO codes on the glove box sticker. Output varies with engine and equipment. Some listings name a specific rating, such as the 105 amp RPO K65 unit.
Is the 2021 Tahoe alternator the same as 2020?
No. The 2021 Tahoe is a new generation with a different engine layout and alternator mounting. Select your exact year in the filter to see the right part.