1967–1972 Chevrolet & GMC Truck Wiring Harnesses (C10, C20, Blazer, Suburban)
For the 1967–1972 C10 and GMC truck era, Painless Performance delivers a wiring solution that merges factory fitment with modern performance. These years are known for clean styling and everyday dependability—your wiring should be the same.
The Painless 28-Circuit Classic-Plus Chassis Harness (P/N 10206) is built specifically for these trucks, featuring a factory-style bulkhead connector that mounts in the stock firewall location—no cutting, drilling, or modification required. Designed to fit C10, C20, C30 pickups, Blazers, and Suburbans, this harness gives you all the circuits needed for stock restoration or modern accessory upgrades like power windows, power locks, and electric fuel pumps.
Each wire is GM color-coded, printed every 12 inches, and pre-terminated for critical factory connections, making installation truly Painless.
Why Choose Painless for Your 1967–1972 Chevy or GMC Truck
- Factory-fit design with bulkhead passthrough—no cutting required
- GM color-coded and printed wires simplify routing and service
- Plug-and-play connectors for ignition, lights, blower, and wipers
- Supports carbureted, LS swap, or EFI conversions
- Extra circuits for power windows, locks, and accessories
- OEM-style durability with modern blade-fuse protection
- Backed by the Painless lifetime warranty and U.S. tech support
28-Circuit Classic-Plus Customizable GM Truck Chassis Harness (P/N 10206)
The Painless 28-Circuit Classic-Plus Harness provides complete wiring coverage for your truck’s engine, interior, and rear sections. With 18 fused circuits, factory GM color coding, and plug-and-play connectors, this harness was engineered for durability, clarity, and convenience.
Whether your 1970 C10 is running its original small block or a late-model LS swap, this harness provides all the electrical infrastructure you need—with extra circuits for modern accessories and performance upgrades.
Key Features:
28 total circuits / 18 fuses with horn relay and maxi fuse
Factory-style bulkhead connector for true OEM fitment
Pre-terminated connections for ignition, lighting, wiper, blower, and cluster circuits
GM color-coded wiring with printed circuit IDs
Supports both carbureted and standalone EFI applications
Compatible with C10, C20, C30, Blazer, and Suburban models
Designed for 1967–1972 Chevy/GMC pickups
Includes Circuits For:
A/C & Heat, Camper Light, Backup Lights, Brake Lights, Charging, Cruise Control, Dome Light, Electric Choke, Electric Fuel Pump, Emergency Flashers, Fan Relay Power, Fused Power Source, Headlights, Horn (Relay), Ignition Coil, Instrument Lighting & Gauges* (Ammeter, Brake Warning, 4WD Light, Fuel, Generator, Oil, Tachometer, Temperature), Park Lights, Power Antenna, Power Door Locks, Power Windows, Radio/Clock (Constant & Switched), Starting, Tail & Third Brake Lights, Turn Signals, and Wipers.
Connections Included:
Ignition switch, headlight switch, dimmer switch, wiper motor, blower motor, blower switch, blower resistor, instrument cluster, 10SI & 12SI alternator, HEI Power & Tach, plus 20 extra 56-series terminals for any factory GM connector (headlight switch, A/C switch, etc.).
Perfect For:
Builders of 1967–1972 Chevrolet and GMC C/K trucks, Blazers, and Suburbans looking for a reliable, modern wiring solution with OEM fitment, extra circuits for future upgrades, and the quality you expect from Painless Performance.