Deutsch DT 4-Pin — Specs and Wiring Guide

The Deutsch DT 4-pin connector is the go-to multi-circuit sealed connector for automotive lighting, relay packs, and sensor harnesses. Four cavities provide enough circuits for power, ground, signal, and a spare — making it a versatile building block in any wiring harness design. The DT 4-pin is the most popular choice for connecting LED light bars that require separate high-beam and low-beam trigger wires, relay-controlled accessory circuits such as compressors and lockers, and sensors that carry both power and analog or digital signal lines. Off-road builders commonly use the DT 4-pin at the firewall pass-through to consolidate auxiliary circuits into a single disconnect point. The connector shares the same size 16 contacts and wedgelock retention system as every other DT variant, so you can stock one contact type for your entire DT harness.