FREE SHIPPING
Free shipping on every order — no minimum purchase required.DESCRIPTION
Mack 4MR21074M2 Fuse Block Box Relay Assembly — OEM replacement fuse and relay distribution center for Mack heavy-duty trucks. This genuine part manages electrical circuit protection and relay switching across your vehicle's critical systems.
Key specifications:
- OEM Mack part number 4MR21074M2
- Complete fuse block and relay housing assembly
- Designed for Mack commercial trucks
- Factory-direct reliability and compatibility
Upgrade from a faulty or corroded fuse block to restore proper electrical distribution and prevent system failures. Includes free shipping.
SHIPPING & RETURNS
SHIPPING
- Free Shipping on all orders — no minimum purchase required.
- Orders are dispatched within 24 hours of purchase (business days).
- Estimated delivery: 2–5 business days within the contiguous United States.
- Tracking information emailed as soon as your order ships.
RETURNS
- Exchanges accepted — we want you to be completely satisfied.
- If a part does not fit or is not as described, contact us within 7 days for an exchange.
- Items must be in original, unused condition and in original packaging.
WARRANTY
- 1-Year extended warranty available at additional cost — ask us for details.
FITMENT & COMPATIBILITY
Please verify that this part is compatible with your vehicle's year, make, model, and trim level before ordering. Part numbers and fitment details are listed in the product description. If you have any questions about compatibility, our team is happy to help — contact us by phone or email before purchasing.
Phone: (803) 723-7074
Email: sales@findmypart.shop
Hours: Mon–Fri, 9am–5pm EST
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