What role do Relay Boxes play in the operation of electrical accessories on Mazda 3?

Several electrical accessories in the vehicle, such as the fuel injection system, horns, starter, and fog lamps, use relays to transmit the electrical signal to the component. Relays operate by using a low-current circuit to open and close a high-current circuit. If a relay is defective, the associated component will not function properly. Most relays are typically mounted in the engine compartment and interior fuse or relay boxes.

What role do Relay Boxes play in the operation of electrical accessories on Mazda 6?

The vehicle has several electrical accessories which use relays to pass the electrical signal to the component like the fuel injection system, horns, starter and fog lamps. Relays are used to open and close a high current circuit (the power circuit) using a low current circuit (the control circuit). In the case of faulty relay, the part will not work correctly. A majority of the relays are located in the engine compartment and interior fuse relays.

Genuine Mazda Relay Boxes

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69 Relay Boxes found

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Mazda Junction Block Part Number: MH01-30-2G0
$638.04 MSRP: $871.81
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Product Specifications
- Other Name: Box, Junction; Junction Block
Fits the following Mazda Models:
- MX-30 EV | 2022-2023 | Base, Premium Plus | BATTERY EV (EV/BEV)
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Mazda Fuse & Relay Box Part Number: GR6H-67-010H
$1027.11 MSRP: $1403.43
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Product Specifications
- Other Name: Harness, Front
- Replaces: GR6H-67-010G, GR6H-67-010C, GR6H-67-010B, GR6H-67-010F, GR6H-67-010D, GR6H-67-010A, GR6H-67-010, GR6H-67-010E
Fits the following Mazda Models:
- 6 | 2003-2008 | S | 6 Cyl 3.0 L GAS
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Mazda Fuse & Relay Box Part Number: GHP9-66-730
$16.11 MSRP: $21.50
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Product Specifications
- Other Name: Block, Fuse
Fits the following Mazda Models:
- 6 | 2014-2021 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature, Sport, Touring | 4 Cyl 2.5 L GAS
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Mazda Fuse & Relay Box Part Number: GS1D-66-730
$15.40 MSRP: $20.54
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Product Specifications
- Other Name: Block, Fuse
Fits the following Mazda Models:
- 6 | 2009-2013 | i, S | 4 Cyl 2.5 L GAS, 6 Cyl 3.7 L GAS
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Mazda Relay Box Part Number: TK79-66-750A
$43.39 MSRP: $57.85
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Product Specifications
- Other Name: Block, Relay
Fits the following Mazda Models:
- CX-9 | 2016-2023 | Carbon Edition, Grand Touring, Signature, Sport, Touring, Touring Plus | 4 Cyl 2.5 L GAS
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Mazda Relay Box Part Number: EG23-66-750
$42.48 MSRP: $56.64
You Save: $14.16 (25%)
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Product Specifications
- Other Name: Box, Relay
- Replaces: EG21-66-750A
Fits the following Mazda Models:
- CX-7 | 2007-2012 | Grand Touring, Sport, SV, Touring | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mazda Relay Box Part Number: TE71-66-750
$43.99 MSRP: $58.66
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Product Specifications
- Other Name: Block, Relay
Fits the following Mazda Models:
- CX-9 | 2010-2015 | Grand Touring, Sport, Touring | 6 Cyl 3.7 L GAS
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Mazda Module Part Number: BDTS-67-5L0H
$84.43 MSRP: $112.58
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Product Specifications
- Other Name: Unit, Electric Supply-Driver; Module
- Position: Left
- Replaces: BDTS-67-5L0E, BDTS-67-5L0G, BDTS-67-5L0D
Fits the following Mazda Models:
- 3 | 2019-2024 | 2.0, Base, Preferred, Premium, Select, Select Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- CX-30 | 2020-2023 | 2.5 S, 2.5 S Carbon Edition, 2.5 Turbo, Base, Preferred, Premium, Select | 4 Cyl 2.5 L GAS
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Mazda Module Part Number: BDTS-67-5M0H
$110.61 MSRP: $147.51
You Save: $36.90 (26%)
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Product Specifications
- Other Name: Unit, Electric Supply-Passenger; Module
- Position: Right
- Replaces: BDTS-67-5M0G, BDTS-67-5M0E, BDTS-67-5M0D
Fits the following Mazda Models:
- 3 | 2019-2024 | 2.0, Base, Preferred, Premium, Select, Select Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- CX-30 | 2020-2023 | 2.5 S, 2.5 S Carbon Edition, 2.5 Turbo, Base, Preferred, Premium, Select | 4 Cyl 2.5 L GAS
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Mazda Relay Box Part Number: TE70-66-750
$92.38 MSRP: $123.19
You Save: $30.81 (26%)
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Product Specifications
- Other Name: Block, Relay
Fits the following Mazda Models:
- CX-9 | 2010-2015 | Grand Touring, Sport, Touring | 6 Cyl 3.7 L GAS
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Mazda Relay Box Part Number: TD11-66-750
$16.78 MSRP: $128.93
You Save: $112.15 (87%)
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Product Specifications
- Other Name: Block, Relay
Fits the following Mazda Models:
- CX-9 | 2007-2009 | Grand Touring, Sport, Touring | 6 Cyl 3.5 L GAS, 6 Cyl 3.7 L GAS
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Mazda Module Part Number: BGBS-67-5Z0
$125.24 MSRP: $167.02
You Save: $41.78 (26%)
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Product Specifications
- Other Name: Electric Supply Unit; Module
- Replaces: DGJ4-67-5Z0
Fits the following Mazda Models:
- 3 | 2022-2024 | 2.0, Preferred, Premium, Select, Select Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- CX-50 | 2023-2024 | 2.5 S, 2.5 Turbo | 4 Cyl 2.5 L GAS
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Mazda Fuse & Relay Box Part Number: BBM6-66-760
$122.08 MSRP: $162.80
You Save: $40.72 (26%)
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Product Specifications
- Other Name: Block, Main Fuse
Fits the following Mazda Models:
- 3 | 2011-2013 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mazda Fuse & Relay Box Part Number: GHP9-66-760
$144.68 MSRP: $192.93
You Save: $48.25 (26%)
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Product Specifications
- Other Name: Block, Main Fuse
Fits the following Mazda Models:
- 6 | 2014-2016 | Grand Touring, Sport, Touring | 4 Cyl 2.5 L GAS
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Mazda Module Part Number: BCKA-67-5M0F
$175.16 MSRP: $233.60
You Save: $58.44 (26%)
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Product Specifications
- Other Name: Unit, Electric Supply-Passenger; Module
- Position: Right
- Replaced by: BCKA-67-5M0G
- Replaces: BCKA-67-5M0C, BCKA-67-5M0D, BCKA-67-5M0E
Fits the following Mazda Models:
- 3 | 2019-2024 | 2.0, 2.5 Carbon Turbo, 2.5 S, 2.5 Turbo, 2.5 Turbo Premium Plus, Base, Carbon Edition, Preferred, Premium, Select, Select Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda Fuse & Relay Box Part Number: TK48-66-760
$173.84 MSRP: $231.83
You Save: $57.99 (26%)
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Product Specifications
- Other Name: Block, Main Fuse
Fits the following Mazda Models:
- 6 | 2017-2021 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature, Sport, Touring | 4 Cyl 2.5 L GAS
- CX-9 | 2016-2023 | Carbon Edition, Grand Touring, Signature, Sport, Touring, Touring Plus | 4 Cyl 2.5 L GAS
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Mazda Module Part Number: BCKA-67-5L0G
$176.79 MSRP: $235.76
You Save: $58.97 (26%)
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Product Specifications
- Other Name: Unit, Electric Supply-Driver; Module
- Position: Left
- Replaces: BCKA-67-5L0F, BCKA-67-5L0E, BCKA-67-5L0D, BCKA-67-5L0C
Fits the following Mazda Models:
- 3 | 2019-2024 | 2.0, 2.5 Carbon Turbo, 2.5 S, 2.5 Turbo, 2.5 Turbo Premium Plus, Base, Carbon Edition, Preferred, Premium, Select, Select Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda Fuse & Relay Box Part Number: B62S-66-760
$197.70 MSRP: $263.65
You Save: $65.95 (26%)
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Product Specifications
- Other Name: Block, Main Fuse; Fuse & Relay Box
- Replaces: BHR1-66-760, BHR1-66-760A
Fits the following Mazda Models:
- 3 | 2014-2018 | Grand Touring, i Grand Touring, I Sport, i SV, I Touring, s Grand Touring, s Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda Fuse & Relay Box Part Number: BFD2-66-760
Product Specifications
- Other Name: Block, Main Fuse
Fits the following Mazda Models:
- 3 | 2013 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mazda Fuse & Relay Box Part Number: BBM5-66-760B
Product Specifications
- Other Name: Block, Main Fuse
- Replaces: BBM5-66-760A
Fits the following Mazda Models:
- 3 | 2010 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS

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Mazda Relay Boxes

Mazda Relay Boxes deliver reliable organized power distribution ensuring that no matter how onboard systems work, they are responsive and protected, making drivers feel at ease in any situation. Building its reputation on spirited driving since the first car in 1931, Mazda later released car-driving thrills with the rotary engine and today creates efficiency with Skyactiv technology. The brand combines the Kodo Soul of Motion styling with i-Activsense safety aids for watching lanes, adjusting speed and supporting alert steering, while new electric and mild hybrid options demonstrate Mazda's commitment to cleaner travel. This balance of performance, design and responsibility ensures that every Mazda has an engaging drive on the winding roads while also proving practical in daily use. Inside the engine bay, the Relay Boxes sit in a molded enclosure that protects the delicate switching units from heat, vibration and moisture. Each plug-in relay functions similarly to a quick acting gate, opening to allow current to flow to radios, lights and charging ports then closing off to prevent surges from flowing through your circuits and damaging them. A printed diagram on the snap lid helps owners match each relay to its circuit, and the spacious two-level layout of newer assemblies provides additional space for adding to the capacity for future features without altering the basic job. By centralizing these protective switches, Relay Boxes make for easier troubleshooting and longer life for the entire electrical network, maintaining an unmistakable driving experience that Mazda drivers love.

You'll get great performance and real durability when you pick genuine OEM Relay Boxes. Mazda builds these using high-quality materials and official factory methods to ensure they hold up mile after mile. You deserve that Mazda reliability without the headache of cheap knockoffs. It is easy to find exactly what you need in our huge inventory of genuine parts. Plus, every OEM part carries a real manufacturer's warranty for your peace of mind. You will love our low prices too. Order today and we will ship your brand-new parts fast. They often reach your door in just a few days.

Mazda Relay Boxes Parts and Q&A

Fuse & Relay Box
BBM6-66-760
Q: What role do Relay Boxes play in the operation of electrical accessories on Mazda 3?
A:
Several electrical accessories in the vehicle, such as the fuel injection system, horns, starter, and fog lamps, use relays to transmit the electrical signal to the component. Relays operate by using a low-current circuit to open and close a high-current circuit. If a relay is defective, the associated component will not function properly. Most relays are typically mounted in the engine compartment and interior fuse or relay boxes.
Fuse & Relay Box
GP9B-66-730A
Q: What role do Relay Boxes play in the operation of electrical accessories on Mazda 6?
A:
The vehicle has several electrical accessories which use relays to pass the electrical signal to the component like the fuel injection system, horns, starter and fog lamps. Relays are used to open and close a high current circuit (the power circuit) using a low current circuit (the control circuit). In the case of faulty relay, the part will not work correctly. A majority of the relays are located in the engine compartment and interior fuse relays.