How to replace the alternator in a 4.3L engine on GMC Sierra 1500?

Disconnect the negative Battery Cable before removing the air cleaner outlet resonator, for changing the generator for a 4.3l engine. Then remove the Drive Belt together with removing the engine wiring harness clip from the A/C Compressor/condenser hose bracket and removing the A/C Compressor and condenser hose bracket bolt. Disengage heater outlet hose clamp bolt at the generator bracket, release generator electrical connector from the engine wiring harness, then reposition the boot on engine wiring harness. Unfasten the engine wiring harness nut from the generator and the engine wiring harness lead from the generator stud. Then remove the generator bolts and reset the heater outlet and the A/C Compressor/condenser hoses to take out the generator from the generator bracket. For installation, position the generator into the generator bracket and adjust the heater outlet and A/C Compressor/condenser hoses per your requirement. Mount the generator bolts and snug them up tight using a 50 n.m (37 lb ft) tightening torque. Connect the lead of the engine wiring harness to the generator stud and fasten the engine wiring harness nut to the generator, tightening to 9 n.m (80 lb in). Put on the engine wire harness boot over the generator stud & hook the engine wiring harness electric connector to the generator. Mount the heater outlet hose clamp bolt at the generator bracket, securing at 25 n.m (18 lb ft), then the A/C Compressor and condenser hose bracket bolt at the same torque. To reinstall the engine wiring harness clip to the A/C Compressor/condenser hose bracket as well as the Drive Belt, reinstall the air cleaner outlet resonator and reconnect the negative Battery Cable.

OEM GMC Sierra 1500 Alternator

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24 Alternators found

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GMC Sierra 1500 Alternator Part Number: 22781131
$271.79 MSRP: $599.42
You Save: $327.63 (55%)
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Product Specifications
- Other Name: Generator Assembly; Generator, Engine Electrical
- Replaces: 19118686, 15847291, 94665137, 15222342, 15124532, 15222341, 15226003, 20989651
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2007 GMC Sierra 1500 | Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Alternator Part Number: 20881337
$272.93 MSRP: $541.76
You Save: $268.83 (50%)
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Product Specifications
- Other Name: Generator Assembly; Generator, Engine Electrical
- Replaces: 15905874, 25869451, 15905872, 22781127, 25968616
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2013 GMC Sierra 1500 | Denali, Hybrid, SL, SLE, SLT, WT, XFE | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L FLEX, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L FULL HYBRID EV-FLEX (FHEV), 8 Cyl 6.0 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L FLEX, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Alternator Part Number: 22949467
$262.87 MSRP: $493.66
You Save: $230.79 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Generator Assembly
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2018 GMC Sierra 1500 | Base, Denali, SLE, SLT | 6 Cyl 4.3 L FLEX, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 5.3 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Alternator Part Number: 19244751
$309.77 MSRP: $604.07
You Save: $294.30 (49%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Generator Assembly, (Remanufacture); Generator, Engine Electrical
- Replaces: 10464476, 15200109, 15263859, 20989650, 22781130, 19151921
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2007 GMC Sierra 1500 | Base, Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Alternator Part Number: 84143540
$366.39 MSRP: $706.05
You Save: $339.66 (49%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Generator Assembly-.; Generator, Engine Electrical
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2015-2018 GMC Sierra 1500 | Base, Denali, SLE, SLT | 6 Cyl 4.3 L FLEX, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 5.3 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Alternator Part Number: 84143543
$319.65 MSRP: $587.47
You Save: $267.82 (46%)
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Product Specifications
- Other Name: Generator, Auxiliary; Generator, Engine Electrical
- Replaces: 22747896, 23487089
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2019 GMC Sierra 1500 | AT4, Base, Denali, Elevation, SLE, SLT | 6 Cyl 4.3 L FLEX, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 5.3 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Alternator Part Number: 13539726
$177.07 MSRP: $317.62
You Save: $140.55 (45%)
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Product Specifications
- Other Name: Generator Assembly-.; Generator, Engine Electrical
- Replaced by: 85671416
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2022 GMC Sierra 1500 | AT4, AT4X, Base, Denali, Denali Ultimate, Elevation, Pro, SLE, SLT | 6 Cyl 4.3 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Alternator Part Number: 13539729
$239.76 MSRP: $430.06
You Save: $190.30 (45%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Generator Assembly-.; Generator, Engine Electrical
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2022-2023 GMC Sierra 1500 | AT4, AT4X, Denali, Denali Ultimate, Elevation, SLE, SLT | 6 Cyl 3.0 L DIESEL
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GMC Sierra 1500 Alternator Part Number: 13552639
$251.66 MSRP: $451.40
You Save: $199.74 (45%)
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Product Specifications
- Other Name: Generator Assembly-.; Generator, Engine Electrical
- Replaced by: 13561037
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2023 GMC Sierra 1500 | Elevation, Pro, SLE | 4 Cyl 2.7 L GAS
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GMC Sierra 1500 Alternator Part Number: 15128978
$325.33 MSRP: $609.73
You Save: $284.40 (47%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Generator; Generator, Engine Electrical
- Replaces: 10371020
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006 GMC Sierra 1500 | Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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GMC Sierra 1500 Alternator Part Number: 13540929
$253.87 MSRP: $455.38
You Save: $201.51 (45%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Generator Assembly-.; Generator, Engine Electrical
- Replaced by: 13561038
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2023 GMC Sierra 1500 | AT4, Denali, Denali Ultimate, Elevation, SLE, SLT | 6 Cyl 3.0 L DIESEL
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GMC Sierra 1500 Alternator Part Number: 13532887
$228.78 MSRP: $410.36
You Save: $181.58 (45%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Generator Assembly-.
- Replaced by: 13563315
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2022 GMC Sierra 1500 | Base, Elevation, Pro, SLE | 4 Cyl 2.7 L GAS
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GMC Sierra 1500 Alternator Part Number: 13540926
$208.18 MSRP: $373.42
You Save: $165.24 (45%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Generator Assembly-.
- Replaced by: 13561036
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2022-2023 GMC Sierra 1500 | AT4, AT4X, Denali, Denali Ultimate, Elevation, Pro, SLE, SLT | 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Alternator Part Number: 13552638
$226.27 MSRP: $405.86
You Save: $179.59 (45%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Generator Assembly-.; Generator, Engine Electrical
- Replaced by: 13561034
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2022-2023 GMC Sierra 1500 | AT4, AT4X, Denali, Denali Ultimate, Elevation, Pro, SLE, SLT | 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Alternator Part Number: 19244746
$373.08 MSRP: $727.88
You Save: $354.80 (49%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Generator Assembly, (Remanufacture); Generator, Engine Electrical
- Replaces: 19151915, 10464453
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2002 GMC Sierra 1500 | Base, C3, Denali, HT, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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GMC Sierra 1500 Generator Part Number: 24287484
$988.84 MSRP: $1562.89
You Save: $574.05 (37%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Generator, Engine Electrical; Alternator
- Replaces: 24283253, 24275333, 24285162, 24283952
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2016-2018 GMC Sierra 1500 | Base, Denali, SLE, SLT | 6 Cyl 4.3 L FLEX, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 5.3 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 6.2 L GAS
View related parts
GMC Sierra 1500 Alternator Part Number: 15263858
Product Specifications
- Other Name: Generator Assembly; Generator, Engine Electrical
- Replaces: 10392759
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2007 GMC Sierra 1500 | Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
View related parts
GMC Sierra 1500 Alternator Part Number: 19244727
$172.06 MSRP: $298.21
You Save: $126.15 (43%)
Product Specifications
- Other Name: Generator Assembly, (Remanufacture); Generator, Engine Electrical
- Replaces: 10464438, 19151893, 10464451, 10464404, 19151891
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1999-2002 GMC Sierra 1500 | Base, C3, Denali, HT, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
View related parts
GMC Sierra 1500 Alternator Part Number: 19244731
$286.05 MSRP: $511.62
You Save: $225.57 (45%)
Product Specifications
- Other Name: Generator Assembly, (Remanufacture); Generator, Engine Electrical
- Replaces: 19151898, 10464481
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2006 GMC Sierra 1500 | Base, Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
View related parts
GMC Sierra 1500 Alternator Part Number: 13539731
$239.30 MSRP: $429.23
You Save: $189.93 (45%)
Product Specifications
- Other Name: Generator Assembly-.; Generator, Engine Electrical
- Replaced by: 13563316
- Replaces: 13534129, 13598307
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2020-2022 GMC Sierra 1500 | AT4, AT4X, Denali, Denali Ultimate, Elevation, SLE, SLT | 6 Cyl 3.0 L DIESEL

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GMC Sierra 1500 Alternator

Want to cut long-term maintenance and repair costs? Choose OEM Alternator. Those parts deliver top durability you can trust. On our site, you'll find a huge catalog of genuine GMC Sierra 1500 parts. Prices are unbeatable, so you can keep more in your pocket. Every OEM GMC Sierra 1500 Alternator includes a manufacturer's warranty. You can also get an easy return policy that keeps buying risk free. Fast delivery, get your car on the road quickly. It's simple to search, compare, and order. Stop guessing about quality or fit. Order today and save with parts that last.

GMC Sierra 1500 Alternator Parts Questions & Experts Answers

Alternator
20881337
Q: How to replace the alternator in a 4.3L engine on GMC Sierra 1500?
A:
Disconnect the negative Battery Cable before removing the air cleaner outlet resonator, for changing the generator for a 4.3l engine. Then remove the Drive Belt together with removing the engine wiring harness clip from the A/C Compressor/condenser hose bracket and removing the A/C Compressor and condenser hose bracket bolt. Disengage heater outlet hose clamp bolt at the generator bracket, release generator electrical connector from the engine wiring harness, then reposition the boot on engine wiring harness. Unfasten the engine wiring harness nut from the generator and the engine wiring harness lead from the generator stud. Then remove the generator bolts and reset the heater outlet and the A/C Compressor/condenser hoses to take out the generator from the generator bracket. For installation, position the generator into the generator bracket and adjust the heater outlet and A/C Compressor/condenser hoses per your requirement. Mount the generator bolts and snug them up tight using a 50 n.m (37 lb ft) tightening torque. Connect the lead of the engine wiring harness to the generator stud and fasten the engine wiring harness nut to the generator, tightening to 9 n.m (80 lb in). Put on the engine wire harness boot over the generator stud & hook the engine wiring harness electric connector to the generator. Mount the heater outlet hose clamp bolt at the generator bracket, securing at 25 n.m (18 lb ft), then the A/C Compressor and condenser hose bracket bolt at the same torque. To reinstall the engine wiring harness clip to the A/C Compressor/condenser hose bracket as well as the Drive Belt, reinstall the air cleaner outlet resonator and reconnect the negative Battery Cable.