Parts / Control Panels / Chassis Tie-In Fuse/Relay Panel

BuckWired chassis tie-in fuse and relay panel

FRP-T2COR2

Chassis Tie-In Fuse/Relay Panel

Every conversion needs somewhere the 12V side comes together — pumps, fans, enables, the whole list of things that have to switch when the key turns. This is that place, fused and relayed and labeled, built around the circuits your car actually has.

$850 Made to order · ships in 1–2 weeks

FusingMini ATC

Layout40 fuse / 10 relay

Lead time1–2 weeks

Warranty90 days

Request a quote Work through the design checklist

Built in Oceanside, CA — by the person who answers your email
One price — $850 whatever you put on it
Warranty: 90 days from delivery
Shipping: UPS, $50 per order, insured for full value
International: by quote — email us

What it is

The 12V side is the half nobody plans for

Your BMS and controller decide what needs switching, but they cannot switch it. Most of their outputs are low current — a couple of hundred milliamps, enough to pull a relay coil, nowhere near enough to run a coolant pump or a radiator fan. This panel is the layer in between: the relays those drivers pull, the fuses on the circuits they close, and one labeled place where all of it lives instead of a nest of inline fuses zip-tied behind the dash.

Mini ATC fusing

Standard blade fuses you can buy at any parts store at 9pm, not something you have to order and wait a week for.

Relayed

Most BMS outputs are low current — a couple of hundred milliamps on an Orion, about an amp on a Vero. Enough to pull a relay coil or an economized contactor, and no more. Nothing on your car runs directly off one. The relays here are what turn that signal into a switched circuit that can actually carry a fan or a pump. Every relay is a Song Chuan ISO 280 micro at 35A, so the panel is not the limit on what you can switch.

Deutsch DTM connectors

Circuits land in DTM housings grouped by type, every wire marked with printed heat shrink. The mating halves ship with the panel, so your side is a crimp rather than a sourcing exercise.

Built to your list

The relay layout comes from your car and from what your BMS and controller can drive. The price does not move with it — an Orion 2 build and a Vero build cost the same.

One place

Everything on the 12V side lands here, so there is one panel to check rather than six inline fuses in six places.

Works with anything

AEM EV, Dynam Labs, Netgain, Curtis or a collection of controllers with no central VCU. The panel does not care.

How your panel gets prewired

You send the checklist. Controller, BMS, and the relays your car calls for. That is the specification we build from.
We lay out the panel. Relay positions and Mini ATC fuse values are assigned per circuit, sized to the load each one carries and grouped so related circuits land together.
We prewire it. Every circuit is run and terminated into Deutsch DTM housings, grouped so alike inputs and outputs share a connector rather than being scattered across the panel. Each wire is labeled with printed heat shrink at the connector. The mating half of every connector we terminate ships with the panel, so you are not sourcing housings or hunting part numbers to land your side.
Labeled and documented. Every circuit marked on the panel, with a printed schematic in the box matched to the list it was built from.
You wire the car to it. Your side is the runs out to the car — the 80A feed onto the bus, grounds, and the circuits from the mating connectors to your pumps, fans, lights and enables. You crimp into housings that are already labeled and already grouped, against a printed schematic that matches your build.

Relay notes and output counts are taken from manufacturer documentation. If your BMS or controller is configured differently from the defaults, tell us and we will build to what you are actually running.

Specifications

Spec sheet

If something you need isn’t here, ask — it means we haven’t written it down yet, not that we don’t know it.

Electrical

System	12V
Bus input	80A
Fusing	Mini ATC blade
Fuse positions	40
Relay positions	10
Bus	Dual bussed
Circuits used	Build specific
Relays	Song Chuan ISO 280 micro, 35A
Bus rating	100A per bus bar, 200A max
Wire size accepted	12–22 AWG
Main feed	80A on the bus
Terminals	Metri-Pack 280 Series, sealed

Physical

Enclosure	94V-0 thermoplastic, silicone gasket
Dimensions	235 × 216 × 94mm
Panel cut-out	197.5 × 124.4mm
Mounting	4× #10-32 or M5, rear of panel
Input studs	M8 × 1.25
Ingress	IP66 with cover and seal
Temperature	-40°C to 85°C
Labeling	Every circuit marked

Order & support

Price	$850, all configurations
Lead time	1–2 weeks
Built in	Oceanside, CA
Shipping	UPS, $50 per order
International	By quote only
Warranty	90 days from delivery
Documentation	Printed schematic in the box

Compatibility

This is the integration path

Our plug-and-play harnesses cover the EV-Controls T2-C to Tesla drive units. Everything else ties into the car here — not as a fallback, but because a panel built to your circuit list is the right answer when both ends aren’t a known pair.

Controllers

AEM EV VCU275
Dynam Labs VCU+
Netgain X1
Curtis 1238 / 1239(e)
EV-Controls T2-C, with the drive unit harness
Controller collection, no central VCU

Motor setups

Cascadia IM225 / IM375
Netgain Hyper9 / Hyper9HV
HPEVS AC-34, AC-50, AC-35, AC-51
Tesla S/X LDU and SDU

Battery management

Orion 2
Thunderstruck MCU
Vero BMS V2
AEM EV BMSM

Pairs with

HV Contactor Box
Coil control circuits
Precharge enable
HVIL loop

⚡

Low voltage, real consequences

This panel is 12V, but what it switches isn’t. Contactor coils, precharge enable and the HVIL loop all run through here, which means a fault on this side can leave a high-voltage system in a state you didn’t intend. Treat it as part of the safety chain, not as accessory wiring.

A printed schematic ships with every panel, marked to the circuit list it was built from.

Questions

About this panel

Does the price change with what I select?

No. $850 covers the panel whatever you put on it — 40 fuse positions and 10 relays either way. The checklist above is not a pricing tool; it is there so you understand what the panel is doing and can plan the wiring that runs past it before anything is permanent.

What do you need from me to build one?

The checklist above, your controller and BMS, and your pack voltage. If anything about the car is unusual — a manual gearbox, a second battery location, lighting that is already LED — mention it, because those are the details that change how the panel is laid out rather than what goes on it.

Do I need this if I’m running a T2-C?

Not necessarily. A T2-C with Tesla drive units is covered by our plug-and-play harness. Where a panel still earns its place is everything around the drivetrain — pumps, fans, heater, charger enables — which the harness doesn’t touch.

Can I add circuits later?

On the fused side, yes — 40 positions is more than any conversion we have built uses, so there is room to add circuits without touching what is already there. The relays are the tighter side: with ten positions and the list above, most builds use all of them. If you know you want something later, say so now and we will lay the panel out with it in mind.

Does it replace the contactor box?

No. The contactor box handles the high-voltage side — main contactors, precharge, traction fusing. This panel handles the 12V side that controls and supports it. Most builds use both.

How long until it ships?

One to two weeks from the time your circuit list is confirmed. Every panel is built to order.