BuckWired high-voltage contactor box, built in Oceanside, California

High-Voltage Wiring & Control Systems

The nervous system of your conversion

Contactor boxes, fuse and relay panels, and plug-and-play drive unit harnesses — built to order for EV-Controls, Tesla, Netgain, AEM, Cascadia and Curtis swaps. We wire to Orion, Thunderstruck, Vero and AEM EV battery management.

Find your parts Talk about a full build

Step 1 of your build

Which parts do I need?

Pick your motor setup and controller. Plug-and-play harnesses currently cover EV-Controls T2-C to Tesla drive units — every other controller integrates through the Chassis Tie-In Fuse/Relay Panel. Combinations that don't run together are grayed out.

1 Your motor setup
2 Your controller
3 Your BMS optional
4 Integrations optional

Choose a BMS above to see what can tie in.

// Awaiting selection
// Choose a motor setup and controller to return a part number

Made to order

Parts

Every unit is assembled, labeled and continuity-tested before it ships. Specs below are the short version — full drawings, connector specs and configurator options are on each product page. Wiring directions and pinouts ship printed with the part.

BuckWired high-voltage contactor box

BWDHVPDU

HV Contactor Box

System voltage96–500V
PrechargeIncluded
EnclosureAlum. base + PA66-GF30
SealingGasketed
Lead time1–2 weeks
from $3,100Details
BuckWired chassis tie-in fuse and relay panel

FRP-T2COR2

Chassis Tie-In Panel

Layout40 fuse / 10 relay
FusingMini ATC
Bus input80A
ControllersAEM, Dynam, Netgain, Curtis
Lead time1–2 weeks
$850Details
T2-C to Tesla drive unit wiring harness

T2C-LDU / SDU / LDU+SDU / SDU+SDU

T2-C Drive Unit Harnesses

ControllerEV-Controls T2-C
FitsTesla S/X LDU & SDU
Length options16' / 20' / 24'
Throttle pedalFlying leads opt.
Lead time1–2 weeks
from $620Details

Lead time

Everything is built to order and ships in 1–2 weeks.

Warranty

90 days from delivery on the part and its internal components. Terminations you crimp, and gear powered through it, sit outside that.

Talk to a builder

Questions before you buy go straight to the bench. will@buckwired.com

Returns

Accepted on approval within 30 days of shipping. Everything is built to order, so get in touch before sending anything back.

Conversions

Builds

Customer cars, client work with partner shops, and our own in-house projects. Every one of them runs BuckWired parts.

1969 Karmann Ghia electric conversion, side profile in green with whitewall tires
Client project · Complete

1969 Karmann Ghia

Built with Sonoma County Street Rodz. Seven Tesla S/X modules split between the rear seat area and the front trunk give a 180V top charge and over 100 miles of range, and the car stays cool and smooth the whole way. The engine bay holds the contactor box, both coolant reservoirs, the Netgain motor and inverter, and our own fuse and relay panel running the show.

  • MotorNetgain Hyper9HV
  • InverterNetgain X1 isolated
  • Pack7× Tesla S/X · 180V
  • Range100+ miles
  • StatusDelivered
1968 VW Type-2 Bus electric conversion
Customer project · In progress

1968 VW Type-2 Bus

A 16-module, 85kWh Tesla pack for serious range, watched by an Orion 2 BMS with CAN-controlled thermal monitoring. A Tesla small rear drive sits where the air-cooled engine used to, on custom CV axles, for 220kW. Pulling the transmission, shifter, heater tubes and cables freed up enough underside room to move the charger, radiators, coolant heater and both pumps out of the cabin entirely. It drives — we're on the creature comforts now, the part that turns a converted bus into one you'd actually take across a state.

  • Pack85kWh · 16 modules
  • Output220kW
  • ControlEV-Controls T2-C
  • BMSOrion 2 + thermal
  • StatusCreature comforts
1975 Ford Bronco electric conversion, side profile
Customer project · In progress

1975 Ford Bronco

A first-generation Bronco receiving a Revolt Systems CR-43 motor and an 85kWh Tesla pack, monitored by a Vero BMS. The original engine is out and the bay is stripped, cleaned and painted, ready for the CR-43. Cabin AC and a heater are in the plan from the start, and Speedhut gauges put state of charge and pack data in instruments that belong in a 1975 truck.

  • MotorRevolt Systems CR-43
  • Pack85kWh Tesla
  • BMSVero BMS
  • GaugesSpeedhut
  • StatusIn progress
Start your build

See all builds

About

Wiring is the part nobody wants to do

I have been in the EV industry since October 2017, and working with wire a lot longer than that — my background is security and alarm systems, where a bad termination is something you find out about at the worst possible moment. Cars were always the other half of it. From 2021 to 2023 I worked at Throtl as a content creator, which put me around a lot of builds and taught me the rest of the car, not just the powertrain swap.

I have wired more than a dozen conversions now. They take six months to a year each, because my builds are rarely just wiring — there is design and fabrication in every one. Somewhere in the middle of that I kept building the same things: a contactor box, a drive unit harness, a panel to tie the 12V side together. Then I realized those parts were not specific to my cars at all. They work across controllers, across BMS brands, across pack voltages.

So I started selling them. Not because the community needs another supplier, but because these particular pieces are the ones that stall builds, and there was no reason for everyone to solve them from scratch.

Motors and batteries get the attention. What actually decides whether a conversion drives — or sits in a garage for two years — is the wiring between them. That's the only thing we build.

Work with us

More on @Buckwired — also on Rumble and Instagram.

Support

Before you order

How do I order?

There is no cart. Request a quote from any product page, from the parts finder above, or with the form below. We reply from will@buckwired.com, usually within a day, with a quote and an invoice. The build starts once your configuration is confirmed.

How long until my order ships?

Every part is built to order — nothing sits on a shelf. Everything typically ships in one to two weeks from the time we confirm your configuration. If you are working to a deadline, tell us up front and we will be straight with you about whether we can hit it.

What's covered under warranty?

90 days from delivery, covering the part itself and its internal components. We date it from delivery rather than installation because a part can sit on a shelf for months before it goes in a car. Any terminations you crimp yourself after delivery — the HV lugs on a contactor box, the circuit wires into a panel — are yours, and anything powered through our parts is covered by whoever made it.

Can I return a made-to-order part?

Returns are accepted on approval within 30 days of shipping. Everything we make is built to your configuration, so email us before sending anything back and we will sort out whether a return or a change makes more sense.

How does shipping work?

Everything ships UPS at a flat $50 per order, insured for full value. Putting several parts on one order costs less than ordering them one at a time. International shipping is quoted individually — VAT and import handling vary too much by country to price up front. Email will@buckwired.com with your destination and we’ll quote it.

My controller or motor isn't on your list.

Most of what we build is one-off anyway. Send us your drive unit, controller and pack details through the quote form and we'll tell you whether an existing harness works or whether it needs to be built from scratch.

Do you install, or only supply parts?

Both. Parts go out to builders directly, and full conversions happen in-house and alongside partner shops. A conversion is design and fabrication as much as wiring, so every one is different and they run six months to a year — which means there is no useful starting price to quote. If you have a car in mind, tell us about it and we will have the conversation properly.

Is this safe to wire myself?

High-voltage packs are genuinely dangerous, and our parts are built to be installed by someone who understands HV safety practice — insulated tools, a service disconnect, and never working on a live system alone. We do not require a certification to buy, but we do expect you to know what you are handling. Every part ships with a printed schematic marked to your build, and questions before or during the install come straight to the bench rather than a support queue. If you are unsure about something, ask before you energize anything.

Get a quote

Tell us what you're building

Pricing on any part, custom panels, full conversions, or a harness that isn't in the lineup. We answer every one of these ourselves, usually within a day.