Deutsch DT Connector Guide — Wiring, Pin Sizes and IP67 Explained

What Are Deutsch DT Connectors?

Deutsch DT-style connectors are sealed multi-pin connectors used in automotive, marine, agricultural, and industrial wiring where a reliable, waterproof connection is non-negotiable. They are now the global standard for harsh-environment wiring harnesses.

The DT range uses Size 16 contacts sized for wire from 14 to 20 AWG, in a grey glass-filled nylon housing with an integrated wedgelock that locks the contacts in place once inserted.

IP67 Waterproofing — What Does It Mean?

IP67 is an ingress protection rating that means the connector is:

• Dust tight — total protection against dust ingress
• Waterproof to 1 metre for 30 minutes — full immersion protection

For automotive and marine wiring, IP67 means these connectors can handle rain, pressure washing, submersion, and years of moisture exposure without failing.

DT Connector Pin Configurations

How to Crimp DT Connector Contacts Correctly

DT connectors use Size 16 closed-barrel contacts and require a specific ratchet crimp tool. Using the wrong tool results in a poor crimp that will fail over time.

Step 1 — Strip the wire
Strip 5–6mm of insulation from the wire end. Don't nick the conductor strands.

Step 2 — Select the contact
Choose a pin (male) or socket (female) contact for Size 16 wire.

Step 3 — Position in the crimp tool
Place the contact in the correct die position at the 16 AWG setting.

Step 4 — Insert the wire and crimp
Insert the stripped wire fully into the contact barrel. Squeeze the crimp tool handles until the ratchet releases.

Step 5 — Pull-test
Pull the wire firmly. A correct crimp will not pull out. If it does, start again.

Step 6 — Insert into housing
Push the contact into the connector housing from the rear until you hear a click. Insert the wedgelock from the front to lock all contacts in place.

DT Connectors vs Standard Automotive Connectors

Shop DT Connectors at Auto Relay

Auto Relay stocks DT-style connectors in 2, 3, 4, 6, and 8-pin configurations, plus the correct Size 16 ratchet crimp tool for professional installations.