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2020-2023 GMC Sierra 2500 HD V8 6.6L High Output Alternator Bass Knobs This is a direct fitFitment: This is a direct fit high output alternator for the 2020 2023 GMC Sierra 2500 HD 6. 6L. Being a direct fit, this alternator fits directly into your stock alternator location. Plug: This high output alternator comes with a factory style plug so that your OEM plug will plug directly into the alternator. Therefore, with an OEM style regulator, it will have a factory voltage set point. NOTE: If you require charging at a certain voltage setpoint,