2021 Chevrolet Blazer Electrical Bulb & Socket Parts

This table covers the bulbs in the reverse lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs. Read more

7 Back Up / Reverse Lamp Bulb parts are listed for the 2021 Chevrolet Blazer, from SYLVANIA, WAGNER and GM GENUINE. SYLVANIA 921LL carries the "Popular" badge. All of them fit every engine offered in the 2021 Blazer.

The Extended Life section lists 2 options from SYLVANIA and WAGNER — grouped under the catalog's "Extended Life" designation — the notes column spells out what sets them apart. SYLVANIA 921LL is listed in this group.

The Extra Bright (improved visibility, but shorter life) section lists 1 option from SYLVANIA — grouped under the catalog's "Extra Bright (improved visibility, but shorter life)" designation — the notes column spells out what sets them apart. SYLVANIA 921ST is listed in this group.

In the LED (instant-on, long life, energy-saving) grade, WAGNER supplies 1 part: grouped under the catalog's "LED (instant-on, long life, energy-saving)" designation — the notes column spells out what sets them apart. A representative part number is WAGNER 921WLED.

The Standard Replacement section lists 3 options from WAGNER, GM GENUINE and SYLVANIA — built to original-equipment specification. WAGNER 921 is listed in this group.

Listed part numbers: SYLVANIA 921LL and SYLVANIA 921ST, plus the other parts above.

This table covers the bulbs in the stop lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs. Read more

9 Brake Light Bulb parts are listed for the 2021 Chevrolet Blazer, from SYLVANIA, WAGNER, PHILIPS and 1 other brand. SYLVANIA 7440LL carries the "Popular" badge. All of them fit every engine offered in the 2021 Blazer.

The Extended Life section: 2 options from SYLVANIA and WAGNER. SYLVANIA 7440LL is listed in this group.

The Extra Bright (improved visibility, but shorter life) section: 1 option from SYLVANIA. SYLVANIA 7440ST is listed in this group.

LED (instant-on, long life, energy-saving): 3 parts, from SYLVANIA and PHILIPS. A representative part number is PHILIPS 7440RLED.

The Standard Replacement section: 3 options from WAGNER, GM GENUINE and SYLVANIA. WAGNER 7440 is listed in this group.

This group includes SYLVANIA 7440LL and SYLVANIA 7440ST and the remaining parts above.

This table covers the bulbs that light the headlamps. Typical signs include a dark lamp, a flicker over bumps, or a bulb that keeps failing on one side. Avoid touching a halogen capsule. Repeated failure in one socket is usually the socket or ground, not the bulb. Read more

3 Headlamp Bulb parts for the 2021 Chevrolet Blazer come from 3 brands — GM GENUINE, SYLVANIA and WAGNER. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).

This group includes GM GENUINE 13587843, SYLVANIA D3SSZ and WAGNER D3S.

This table covers the bulbs in the parking lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs. Read more

3 Parking Lamp Bulb parts for the 2021 Chevrolet Blazer come from 2 brands — WAGNER and PHILIPS. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).

Extended Life: 2 parts, from PHILIPS and WAGNER. A representative part number is PHILIPS 7444NALL.

Standard Replacement: 1 part, from WAGNER. A representative part number is WAGNER 7444NA.

Part numbers include PHILIPS 7444NALL and WAGNER 7444NA, among others listed above.

This table covers the bulbs in the side-marker lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs. Read more

GM GENUINE supplies both parts for the 2021 Chevrolet Blazer. All of them fit every engine offered in the 2021 Blazer.

Listed part numbers: GM GENUINE 13503401 and GM GENUINE 13503359.

This table covers the Tail Lamp Socket / Connector plates. Typical signs include warpage, cracks, or a plate that no longer locates the assembly. Confirm which plate the notes describe — backing plates, clutch plates and strike plates are different parts. Read more

2 Tail Lamp Socket / Connector Plate parts for the 2021 Chevrolet Blazer come from GM GENUINE. Every part fits all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6).

Part numbers include GM GENUINE 84308389 and GM GENUINE 84308390.

This table covers the bulbs in the trunk or cargo-area lamp. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs. Read more

This group shows a single part: GM GENUINE 13569063.

This table covers the bulbs in the turn-signal lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs. Read more

5 Turn Signal Lamp Bulb parts are listed for the 2021 Chevrolet Blazer, from WAGNER, PHILIPS, SYLVANIA and 1 other brand. PHILIPS 7444NALL carries the "Popular" badge. All of them fit every engine offered in the 2021 Blazer.

The Extended Life section: 3 options from PHILIPS, SYLVANIA and WAGNER. PHILIPS 7444NALL is listed in this group.

The Standard Replacement section: 2 options from GM GENUINE and WAGNER. GM GENUINE 13579188 is listed in this group.

Part numbers include PHILIPS 7444NALL, among others listed above.

This table covers the sockets that hold a Turn Signal Lamp bulb. Typical signs include a flicker over bumps, melted plastic, or a bulb that will not stay seated. Dielectric grease on the contacts slows corrosion. Do not force a bulb into a heat-damaged socket. Read more

One part is listed for the 2021 Chevrolet Blazer — GM GENUINE 84987048.

This table covers the replacement bulbs for the Vanity Mirror / Sun Visor Light. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs. Read more

This group shows a single part: GM GENUINE 13502343.