Parts / Fuse Box
Used Fuse Box for Medium-Duty Trucks
Under-dash and engine-bay fuse/relay boxes — the cure for melted terminals and phantom power loss.
- Used OEM part
- Tested before shipping
- Electronics warranty
- Ships to the lower 48
Fuse boxes on working trucks fail the slow way: a terminal loosens, heats, discolors, and one day the wipers, fuel pump or the whole ignition feed goes intermittent. Isuzu N-series and Fuso Canter cabs are notorious for corroded under-dash boxes; Ford and GM engine-bay junction boxes cook the high-amp terminals. A new box from the dealer is expensive, frequently discontinued for older trucks, and comes with the same plastic that failed.
We supply complete used OEM fuse/relay boxes from running donor trucks, inspected terminal by terminal for heat damage and corrosion, so you get a clean, tight box that ends the chasing.
Signs your fuse box has failed
- Melted or discolored plastic around a fuse or relay cavity
- Fuses test good but the circuit is dead until you wiggle the box
- A fuse that keeps blowing with no short found in the harness
- Green or white corrosion on terminals, especially on the cab-side box
- Intermittent ignition, fuel pump, wiper or headlamp circuits
- Burnt-plastic smell under the dash or from the engine-bay junction box
Before you order
- Fuse boxes differ by cab, option package and model year — send your VIN and a photo of the box’s part-number label (or a wide photo of the box itself).
- Note which circuits are affected; on some trucks the interior and engine-bay boxes are separate parts (we stock both).
- Find and fix the cause of any melted terminal — an overloaded circuit or an aftermarket accessory tapped into the wrong feed will damage the replacement too.
- Relays and fuses ship with the box as the donor had them; verify amperages against your owner’s manual before starting the truck.
Select your truck for a fuse box quote
Chevrolet
Mitsubishi Fuso
Related parts
Frequently asked questions
Which trucks do you stock a used Fuse Box for?
Isuzu NPR, NQR and NRR; Ford F-450 and F-550; Chevrolet Silverado and GMC Sierra 4500HD/5500HD plus Kodiak and TopKick C4500; Ram 4500 and 5500; and Mitsubishi Fuso Canter FE125–FE180. Pick your truck below or send us your VIN.
Is a used Fuse Box tested before it ships?
Yes. Every fuse box we sell is pulled from a running donor truck, inspected and tested before it ships.
How do I get a quote for a used Fuse Box?
Use the form on this page or call us. Share your truck and VIN and we confirm exact fitment, then call you back with a price in about 30 seconds during business hours — or email it if we can’t reach you.
Is a used Fuse Box covered by a warranty?
Yes — used electronics like this fuse box are backed by our warranty, a category most sellers exclude entirely. Exact terms are confirmed on your quote.
Do you ship a used Fuse Box nationwide?
Yes — we ship to all 48 contiguous states with tracked delivery. Most parts arrive in 3–7 business days; engines, transmissions and axles ship freight and typically arrive in 5–10.
Does a used fuse box come with the fuses and relays?
Yes, as pulled from the donor truck. Verify each fuse rating against your manual before use — a previous owner may have changed one.
Can I just replace the burnt terminal?
Single-terminal repair kits exist for some boxes, but once heat has softened the plastic the terminal will loosen again. A complete inspected box is the reliable fix on a truck that has to earn money.
Is a used electronic module covered by a warranty?
Yes. Electronics are covered under our warranty — a category most used-parts sellers refuse to warranty at all. Programming, where your truck needs it, is the buyer’s responsibility unless agreed on your quote.