Parts / Wiring Harnesses / T2-C Drive Unit Harness

BuckWired T2-C to Tesla drive unit harness, laid out with connectors terminated

Shown with an EV-Controls T2-C and a throttle pedal for context. Neither is included — you get the harness.

T2C-LDU

T2-C Drive Unit Harness

The wiring between an EV-Controls T2-C and a Tesla drive unit, already made. Terminated, labeled and continuity-tested, so the day your motor goes in is about mounting it, not about building a loom from a pinout.

$700 Built to order · ships in 1–2 weeks

ControllerEV-Controls T2-C

Motor setupTesla S/X LDU

Length16 ft

Lead time1–2 weeks

1 — Motor setup

2 — Length

Measure the route, not the straight line — around the firewall, along the frame rail, with slack at both ends. Between two lengths, take the longer one. Need something outside these three? Email us.

3 — Throttle pedal

Standard termination at the pedal end. Either option is the same price.

4 — Chassis Tie-In Panel

The panel is the 12V side of the car: fuses and relays for pumps, fans, contactor enables and lights, built to your circuit list. Quoted together, it arrives wired to match this harness.

5 — BMS needed for a quote

Tell us what watches the pack, so the quote covers the relay outputs and CAN tie-ins that go with it.

Request a quote Not running a T2-C? Start here

Built in Oceanside, CA — by the person who answers your email
Tested before it ships — every harness, end to end
Not included: the T2-C controller and throttle pedal in the photos
Warranty: 90 days from delivery
Shipping: UPS, $50 per order, insured for full value
International: by quote — email us

Why buy it made

The loom is where conversions stall

A drive unit harness is not hard in principle. It is dozens of terminations that all have to be right, in a place you cannot easily get to once the motor is in, on a system that does not tolerate a marginal crimp. Most of the builds that sit unfinished for two years are not waiting on a motor.

Terminated

Cinch 30-pin at the controller, TE Ampseal or Molex at the drive unit, every pin crimped and seated with the correct tooling.

Labeled

Circuits marked so the install is readable a year later, when something needs tracing and the build is a memory.

Tested

Continuity checked end to end before it ships, so a fault you find on the car is a fault you introduced, not one you inherited.

Sleeved

Split braided sleeving, not expandable loom. It opens along its length, so trimming a flying lead to your own bulkhead location is a cut and a re-lay rather than a rebuild.

Correct length

Three lengths so the harness suits the route your car actually needs, instead of coiling four feet of excess behind the firewall. Custom lengths by email.

Plug and play

T2-C on one end, Tesla drive unit on the other. No adapters, no splices, no guessing which pin does what.

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.

Fitment

Controller	EV-Controls T2-C
Drive units	Tesla S/X LDU and SDU
Configurations	LDU, SDU, LDU+SDU, dual SDU
Lengths	16′ / 20′ / 24′

Build

Conductors	UL1003, tinned copper
Strand	Fine-strand, automotive grade
Loom protection	Split braided sleeving
Throttle pedal	Flying leads option
Testing	Continuity, every harness
Documentation	Printed schematic in the box

Connectors

Controller end	Cinch 30-pin
LDU end	TE Ampseal 23-pin
LDU encoder	TE AMP Superseal 4-pin
SDU end	Molex 20-pin
SDU encoder	Internal — none required

Pricing

T2C-SDU	$620
T2C-LDU	$700
T2C-SDUSDU	$790
T2C-LDUSDU	$820
20′ length	+$40
24′ length	+$80
Custom length	By email
Flying leads option	No charge
Not included	T2-C, throttle pedal

Order & support

Lead time	1–2 weeks
Built in	Oceanside, CA
Carrier	UPS
Shipping	UPS, $50 per order
Insurance	Full value, included
International	By quote only
Warranty	90 days from delivery

Compatibility

This one is specific

Our plug-and-play harnesses cover the EV-Controls T2-C to Tesla Model S/X drive units, and nothing else. That is deliberate — a harness is only plug and play if both ends are known. Everything else ties into the car through the Chassis Tie-In Fuse/Relay Panel instead.

Works with

EV-Controls T2-C
Tesla S/X LDU
Tesla S/X SDU
LDU + SDU pairs
Dual SDUs

Not this harness

Tesla Model 3 / Y drive units
AEM EV VCU275
Dynam Labs VCU+
Netgain X1
Curtis 1238 / 1239(e)

Use instead

Chassis Tie-In Panel
$850
Built to your circuit list

Also needed

HV Contactor Box
Pack-side switching
Precharge and fusing

Questions

About this harness

Which length do I need?

Measure the route rather than the distance — around the firewall, along the frame rail, up and over anything in the way, with slack at both ends for service. 16′ is the base length, but most conversions end up needing 20′ once the route is measured. If you are between two lengths, take the longer one: excess can be routed, and short cannot be fixed.

Can I order a custom length?

Yes. Email will@buckwired.com with the route you need and we will build to it. The three stock lengths cover most cars, but long-wheelbase and mid-engine layouts sometimes do not fit any of them.

What are the flying leads for?

The throttle pedal. Choosing flying leads means that run arrives unterminated at the connector end, so you can pass it through a bulkhead or firewall grommet without fighting a connector through the hole, then cut it to your own length. You crimp the contacts at the connector end once it is routed — that part is on you, and it is the trade for being able to run it cleanly.

Does this include the contactor box?

No. This harness carries the connection between the controller and the drive unit. Pack-side switching, precharge and fusing live in the HV Contactor Box, which is a separate part.

Is the T2-C or the throttle pedal included?

No. The photos show the harness plugged into a T2-C and a pedal so you can see where each end lands. You receive the harness only. The controller comes from EV-Controls, and the pedal is whichever one your build uses; the harness terminates to it, or arrives as flying leads if you choose that above.

I’m running an AEM VCU. Does this fit?

No — our plug-and-play harnesses are T2-C only. For an AEM VCU, Dynam Labs VCU+, Netgain X1 or Curtis, the integration happens through the Chassis Tie-In Fuse/Relay Panel, built around your circuit list.

What if I have two motors?

Both dual configurations are stock: LDU + SDU, and dual SDUs. Select it above and the part number changes with it.

How long until it ships?

One to two weeks. Every harness is built to order, so nothing sits on a shelf. If you are working to a deadline, say so up front and we will be straight with you about whether we can hit it.