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1.7.5 Build Sheet — Lighting & SwitchPros

Workbench specs for the SwitchPros lighting harnesses: H4 SwitchPros Front Bundle (forward loads through the dedicated SP bulkhead) and H5 Rear Cabin Trunk Bundle (SwitchPros rear outputs + PMU rear lighting through the cabin trunk to a rear breakout).

LJ Tub Map — Lighting & SwitchPros routing (top-down): SwitchPros controller, forward and rear lighting fan-out, and the H4/H5 runs

Top-down tub map of the lighting harnesses. Diagram source: Jeep LJ Tub Map.drawio (page "Lighting & SwitchPros"); the image is regenerated from the draw.io file on each export.

Reading this sheet: SwitchPros loads arrive on the controller's own 2-pin Delphi pigtails — match those supplied colors rather than re-coloring. PMU outputs and grounds follow the Wire Color Convention (ground = black; signal = builder's choice). These are small-wire lighting bundles, so split loom is fine — use a braided sleeve with a tracer if you'd rather color-code the cabin-trunk pull (Protective Sleeve & Tracers). Other protection standards by location are in Wire Protection Standards; system-wide context is in the Harness Inventory overview.

H4 — SwitchPros Front Bundle

Previously numbered H5. Renumbered 2026-05-31 when the catalog was compacted after the H1+H4 and H6+H7 merges.

Build: 3 SwitchPros outputs (6 conductors) · 4–8 ft depending on destination · Delphi 2-pin at SP side, HDP24-18-14 at firewall · split loom forward.

Route: SwitchPros (firewall, cabin side) → dedicated SwitchPros HDP24-18-14 firewall bulkhead → engine bay → grille / front bumper / front axle

Length: 4–8 ft (depending on destination)

Contains:

SwitchPros output Gauge Color Function Destination SP bulkhead pins
OUT-3 (35A circuit) 14 AWG Per SP pigtail Fog light Front bumper (BD S8 amber) 1 (+) / 2 (−)
OUT-6 (front rocks subset, 15A circuit, shared with rear) 14 AWG Per SP pigtail Front bumper rock light + 2x front wheel well rock lights Splice at front for 3 lights 3 (+) / 4 (−)
OUT-17 (low-side 2A) 18 AWG Per SP pigtail Front ARB locker solenoid Front axle (~12 ft from SP) 5 (+) / 6 (−)

Connectors: Custom 2-pin Delphi at SwitchPros output side (per SP harness convention); harness terminates at HDP24-18-14 cabin-side plug at firewall. Engine-bay side picks up at HDP24-18-14 receptacle and re-terminates as 2-pin Delphi at each light/solenoid.

Ground strategy: Each output's load ground returns through the SP bulkhead (pins 2, 4, 6) to the SwitchPros Ground Bus on cabin side. Clean SP-native architecture; no reliance on chassis ground at forward loads.

Notes:

  • 3 forward-going SwitchPros circuits in this bundle, 6 pins through dedicated SP bulkhead (HDP24-18-14)
  • Front locker wire (18 AWG) is the longest run — passes through front fender well and along front axle
  • Front rock lights (4 in front wheel wells + 1 front bumper) all share OUT-6 with rear rocks
  • Could be split into "front bumper sub-harness" (fog + front rock + front bumper) and "front axle sub-harness" (front locker) if those routings diverge
  • 8 spare pins on SP bulkhead accommodate future ditch/roof additions if A-pillar routing becomes impractical

See SwitchPros Firewall Bulkhead for connector spec and pinout.

H5 — Rear Cabin Trunk Bundle (SwitchPros Rear + PMU Rear)

Formed 2026-05-30 by merging the prior H6 (SwitchPros rear outputs) and H7 (PMU rear lighting). The two shared the firewall-to-rear cabin trunk path, so they are fabricated as a single multi-conductor bundle with a rear cargo bulkhead breakout connector.

Build: ~10 conductors (mostly 14 AWG) · 8–14 ft (PMU portion ~11–16 ft incl. engine-bay leg) · single multi-pin breakout at rear cargo bulkhead · split loom + wrapped sleeve through trans tunnel.

Route: SwitchPros (firewall, cabin side) + PMU24 outputs (via HDP24 pins 4/5/6 from engine bay) → converge at firewall → cabin trunk (trans tunnel) → rear cargo bulkhead breakout → fans out to rear destinations

Length: 8–14 ft (depending on destination; PMU portion is ~11–16 ft total including engine bay leg)

Contains:

Source Output / Function Gauge Color Destination
SwitchPros OUT-6 (shared with front) Rear rocks (rear bumper + 2× rear wheel well) 14 AWG Per SP pigtail Splice at rear for 3 lights
SwitchPros OUT-7 Chase light (BD RTL-S 30") 14 AWG Per SP pigtail Rear bumper
SwitchPros OUT-10 Rear ARB locker solenoid 14 AWG Per SP pigtail Rear axle
SwitchPros OUT-12 Rear work lights (2× BD S1) 14 AWG Per SP pigtail Above license plate
SwitchPros OUT-13 Cargo lights (2× flush in rear wheel wells) 14 AWG Per SP pigtail Triggered by rear cargo rocker
SwitchPros TRIGGER-2 Cargo rocker switch return 18 AWG Per SP pigtail Rear cargo rocker (rear wheel well top)
PMU OUT-21 Brake signal 16 AWG Builder's choice Tail clusters (L+R) + 3rd brake
PMU OUT-22 Reverse signal 16 AWG Builder's choice Tail clusters (L+R)
PMU OUT-23 Running/parking signal 16 AWG Builder's choice Tail clusters (L+R) + license plate
PMU ground return Common tail cluster ground 16 AWG Black SwitchPros GND bus at firewall

Connectors:

  • Firewall (cabin side): SwitchPros outputs originate as Delphi 2-pin pigtails at SP module; PMU outputs enter the cabin via HDP24 pins 4/5/6. Both join the trunk wrap aft of firewall.
  • Rear cargo bulkhead breakout: Single multi-pin connector — Deutsch DT15-XX (15-pin) or AMP CPC ~15-pin. All ~10 conductors mate at this single service point.
  • Rear-side pigtails: Short individual harnesses from breakout to each destination (chase, work, cargo, rocks, locker, tail clusters).

Protection: Split loom + wrapped harness sleeve through cabin trunk. P-clamps every 12–18".

Notes:

  • ~10 conductors in the cabin trunk bundle (mostly 14 AWG + a few 16/18 AWG)
  • Service model: R&R any rear light by swapping its pigtail at the rear bulkhead breakout. The cabin trunk pull stays in place.
  • Splices needed for the tail clusters: each PMU output feeds both driver and passenger sides + 3rd brake/license — can be done at the breakout or with Y-splices closer to lights
  • CT4 rear turn signals could also join this bundle through the cabin trunk; tracked separately because they originate at CT4 (steering column) not firewall