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Tail, Brake & Reverse Lights

Maxbilt Round Trail Tail

Type: LED Tail Light (4-function: Brake, Turn, Marker, Reverse)

Model: Round Trail Tail

Manufacturer: Maxbilt

Product Page: Maxbilt Round LED Tail Lights

Quantity: 2

Mounting: Rear quarter panels

Power Source: CT4 (turn), PMU Out 21 (brake), PMU Out 22 (reverse), PMU Out 23 (marker)

Wire Functions

Color Function Connection Wire Gauge Notes
BLACK Ground Chassis ground 16 AWG Clean metal-to-metal
WHITE Reverse Reverse splice 16 AWG Parallel with Squadron Sport reverse
YELLOW Brake/Turn Turn splice + Brake splice 16 AWG Combined function, internal diodes
RED Marker/Parking Running splice 16 AWG DRL/parking circuit

Reverse Lights

Power: PMU Out 22 (~5A load, 16 AWG) Trigger: Transmission reverse switch → PMU In 3 Circuits: Maxbilt WHITE + Squadron Sport reverse + WolfBox camera trigger (parallel)

Wiring:

  1. Transmission reverse signal → PMU In 3
  2. PMU Out 22 → Maxbilt WHITE + Squadron Sport reverse lights + WolfBox trigger (parallel)
  3. Chassis ground

Load Breakdown:

  • Maxbilt WHITE: ~2A (LED, 130 red + 18 white LEDs total)
  • Squadron Sport pair (557805): 2.8A (1.4A × 2)
  • WolfBox trigger: negligible
  • Total: ~5A (PMU Out 22 capacity: 7A, 71% utilization)

Brake Lights

Power: PMU Out 21 (7A capacity) Trigger: Brake pedal switch → PMU In 2

Brake Light Distribution

PMU Out 21 splices to all brake lights:

Destination Load Wire Notes
Maxbilt Round Trail Tail (YELLOW) ~3A 16 AWG Both tail lights
RTL-S Brake (Yellow) 1.45A Per RTL-S harness Chase light brake function
Total ~4.5A PMU Out 21 capacity: 7A (64%)

Splice Location: Rear of vehicle (accessible for service)

Brake/Turn Signal Integration

Maxbilt Round Trail Tail lights have internal diode isolation for combined brake/turn function. No external diodes required.

Operation:

  • Right turn active → right tail light flashes
  • Brake pressed → both tail lights solid
  • Right turn + brake → right flashes, left stays solid

Marker/Parking Lights

Power: PMU Out 23 (DRL/parking circuit) Maxbilt Connection: RED wire Control: Automatic with ignition Shared Circuit: LP6 DRL

See DRL/Parking Lights for circuit details.

Outstanding Items

  • Plan wire routing from CT4 to rear tail lights
  • Plan wire routing from PMU Out 21/22 to rear tail lights