Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2013SIERRA 3500 2WD V8-6.0LPARTS AND LABORSTARTING AND CHARGINGCHARGING SYSTEMALTERNATORPARTS INFORMATION
2013 GMC Sierra 3500 2WD V8-6.0L
Parts Information
2013 GMC Sierra 3500 2WD V8-6.0LSECTION Parts Information
| Part | Manufacturer | OEM Part # | Price | Notes |
| Alternator | ||||
| 145 Amp | GMO | 20881337 | 362.54 | Alternators Are Sold As Assembly Only. |
| 125 Amp | GMO | 22817848 | 356.92 | Alternators Are Sold As Remanufactured Units. |
| 160 Amp | GMO | 25877026 | 518.48 | Alternators Are Sold As Assembly Only. |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.