1987-1991 Jeep YJ Direct-Fit Wiring Harnesses
The 1987–1991 Jeep YJ marked a new era in Jeep capability but its factory wiring hasn’t aged nearly as well as the rest of the platform. Brittle insulation, corroded terminals, splices from decades of accessories, and worn-out fuse blocks all lead to electrical gremlins that can stop a YJ in its tracks. The Painless 10111 Direct Fit Wiring Harness solves those problems permanently with a modern, Jeep-correct, full-vehicle wiring system engineered specifically for early YJ owners who want reliability, safety, and plug-and-play precision.
Designed as a true factory-fit solution, this harness uses a molded Jeep bulkhead connector to place the fuse block in the OEM location and follows factory routing throughout the chassis. With 23 circuits, Jeep-correct color coding, and printed wire labels on every lead and connector, the 10111 makes a complete electrical overhaul straightforward, whether you’re restoring a carbureted YJ, installing a standalone EFI system, rebuilding a trail rig, or simply eliminating decades of wiring hacks.
All major OE-style connectors are included: speedometer, turn signal switch, ignition switch, gauge cluster, dimmer, brake switch, blower motor, wiper motor, washer pump, tail lamp assemblies, fuel tank sender, underhood lighting, and more. Each connector is hand-terminated to factory standards, giving you a clean installation without cutting, crimping, or adapting generic connectors.
Note: Factory EFI and emissions ICM systems are not supported.
Why the 10111 is the Ultimate Wiring Upgrade for 1987–1991 Jeep YJ Owners
True Jeep YJ Fitment (1987–1991)
This harness is engineered around the original YJ chassis layout, preserving factory connector locations, fuse block position, and wiring paths. No guessing, no universal routing — everything fits where Jeep intended.
Pre-Terminated OEM-Style Connectors
Critical systems plug in exactly like stock:
Gauge cluster & speedometer
Turn switch & dimmer
Ignition switch
Wiper switch & Wiper motor
Brake switch
Tail and marker lights
Fuel tank sender
HVAC resistor & heater switch
Washer pump
Horn
No homemade adapters. No cut-and-splice repairs. Just plug, route, and go.
23 Fully Supported Circuits for Modern Builds
From electric fuel pumps and EFI power to A/C, heat, and upgraded lighting, the 10111 gives you every essential circuit a YJ restoration or restomod demands. High-draw circuits use Midi Fuse protection and modern blade fuses for long-term reliability.
Factory Jeep Color Codes & Printed Wire Labels
Every wire matches Jeep’s original color conventions and is clearly printed for fast identification during installation. Perfect for both first-time builders and experienced restorers.
Supports Carbs or Standalone EFI Systems
Whether you’re keeping your carburetor or upgrading to a self-contained fuel-injection kit, this harness delivers the correct circuits while eliminating unnecessary factory-ECU wiring.
Circuits Included
A/C & Heat, Accessory/Cigarette Lighter, Backup Lights, Brake Lights, Charging System, Dome & Courtesy Lights, Electric Choke, Electric Fuel Pump, Emergency Flashers, Fan Relay Activation Power, Fuel Injection Power, Fused Power Source, Headlights, Horn Relay, Ignition Coil, Instrument Panel Lighting & Gauges*, Park Lights, Radio/Clock (Constant & Switched), Starting, Tail/License Lights, Third Brake Light, Turn Signals, Wipers & Washer Pump (Front & Rear).
*Gauge Circuits Include: Brake Warning Light, 4WD Indicator, Fuel Gauge, HVAC Panel Lighting, Oil Gauge, Tachometer, Temperature Gauge.
Connections Included
Dimmer switch, speedometer, turn switch, ignition switch, gauge cluster, wiper switch, brake switch, wiper motor, tachometer, heater resistor, heater switch, tail lights, fuel tank sender, washer pump, horn, headlights, marker lights, blower motor, turn/park lights.