1978 K10 — Rear Light Wiring

PER SIDE · DEUTSCH DT 6-PIN · 16 AWG (14 AWG GND) · IP68 WATERPROOF

⚠ LICENSE PLATE + MARKER LIGHTS TAPPED FROM RUNNING (PIN 1) POST-CONNECTOR ON LAMP SIDE. PIN 6 SPARE — CAP WITH CAVITY PLUG.
Running
Brake
Turn
Reverse
Ground
License (tap)
Marker (tap)
Spare
RunningOEM harness
Brake3rd brake light circuit
Turn SignalFront turn signal
ReverseOEM harness
GroundOEM harness · 14 AWG
Spare
License plate (tap)
Running — 7443 Lo
Marker light (tap)
Brake — 7443 HiPin 2 → Bulb socket
Turn SignalPin 3 → Bulb socket
ReversePin 4 → Bulb socket
Ground (shared)Pin 5 → All bulb grounds
Spare (capped)
RECEPTACLE · DT04
Vehicle Side · holds PINS
▲ TOP / LATCH
← MATING FACE →
1
2
3
4
5
6
▼ BOTTOM
PLUG · DT06
Lamp Side · holds SOCKETS
▲ TOP / LATCH
← MATING FACE →
1
2
3
4
5
6
▼ BOTTOM

// Pin Assignment Reference

PinCircuitGaugeSuggested ColorSourceDestination
1 Running / Tail 16 AWGBrown OEM Harness 1st 7443 low filament + tap → License + Marker
2 Brake 16 AWGRed 3rd Brake Circuit 1st 7443 high filament
3 Turn Signal 16 AWGYellow Front Turn Signal 2nd 7443 high filament
4 Reverse 16 AWGPurple / White OEM Harness 2nd 7443 low filament
5 Ground 14 AWGBlack OEM Harness All bulb grounds (star pattern)
6 Spare —— Unused Cap with cavity plug

// Post-Connector Splits (Lamp Side)

Running → License + Marker
Pin 1 exits connector on lamp side.
Splice into 3 directions:
 → 7443 socket (running filament)
 → License plate bulb
 → Marker light bulb
Use a 3-way solder splice.
Ground → All Bulbs
Pin 5 exits connector on lamp side.
Split to all bulb ground returns:
 → 7443 socket ground
 → Reverse bulb ground
 → License plate ground
 → Marker light ground
Star pattern preferred over daisy chain.