1947–1954 Chevrolet Truck Wiring Harnesses (Advance Design)
The Advance Design trucks (1947–1954) were built tough—and now your wiring can be too. Painless Performance offers two fully customizable wiring solutions designed specifically for these classic Chevy pickups. Each harness features GM color-coded wiring, printed circuit labels, and ample lengths to handle long-bed or extended-cab trucks.
Whether you’re restoring a 3100 short bed, building a custom shop truck, or upgrading to modern power accessories, these harnesses make installation simple, reliable, and truly Painless.
Why Choose Painless for Your Advance Design Truck
Built for 1947–1954 Chevrolet pickups — long-bed and short-bed compatible
Customizable layouts for stock or upgraded electrical systems
Color-coded, labeled GM wiring for easy troubleshooting
Modern fuse protection — no more brittle glass fuses
Adaptable ignition circuits for any switch or column
All connectors and terminals included — no extra parts to source
Trusted Painless quality backed by lifetime warranty and U.S.-based tech support
21-Circuit Classic Customizable Pickup Chassis Harness (P/N 10104)
The Painless 21-Circuit Classic Customizable 12-Volt Pickup Harness is perfect for trucks that keep a mostly stock electrical setup while upgrading safety and reliability. Designed with long wire runs for long beds or extended cabs, this harness gives you everything needed to modernize your electrical system without losing the classic look.
Each wire is GM color-coded and labeled every 12 inches, making installation intuitive. Open-ended ignition wiring adapts to nearly any switch or column configuration, and the included GM-engineered fuse block mounts cleanly with the Painless bracket.
Key Features:
21 total circuits / 12 fuses with horn relay and maxi fuse
GM color-coded, printed wiring for easy identification
Ample wire length for long-bed and extended-cab trucks
Open-ended ignition switch wiring—adaptable to any ignition system
Pre-wired headlight and dimmer switch plugs
GM-style turn-signal connectors included
Includes Circuits For:
A/C & Heat, Brake & Backup Lights, Charging, Dome Light, Electric Choke, Emergency Flashers, Fan Relay Activation Power, Fused Power Source, Headlights, Horn (Relay), Ignition, Instrument Lighting & Gauges (Fuel, Oil, Tach, Temp, Volt), Park Lights, Radio/Clock, Starting, Tail & Third Brake Lights, Turn Signals, and Wipers.
Connections Included:
GM steering column turn-signal switch, headlight pigtails, 10SI & 12SI alternator connectors, and dimmer switch.
Perfect For:
Builders wanting a clean, factory-style electrical system that’s safe, serviceable, and easy to expand for simple upgrades like electric fans or an aftermarket radio.
NOTE: 12-Volt Systems Only
28-Circuit Classic-Plus Customizable Pickup Chassis Harness (P/N 10204)
The Painless 28-Circuit Classic-Plus 12-Volt Pickup Harness expands on the 21-circuit design, providing everything you need to power today’s upgrades—electric fuel pump, cruise control, power locks, power windows, and more. It’s the ideal choice for a restomod or pro-touring style Advance Design truck.
Every wire is GM color-coded and labeled for easy identification. The long wire lengths ensure this harness fits long-bed and extended-cab trucks just as easily as standard cabs. An open-ended ignition circuit makes adapting to any key or column simple, while the included GM fuse block and mounting bracket give your installation a professional finish.
Key Features:
28 total circuits / 18 fuses with horn relay and maxi fuse
Perfect for trucks with modern electrical accessories
GM color-coded and printed wiring every 12 inches
Open-ended ignition switch wiring—works with any setup
Long wiring for extended cabs or rear-mounted batteries
Pre-wired headlight & dimmer plugs; GM turn-signal connectors included
Includes Circuits For:
A/C & Heat, Accessory, 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 (Fuel, Oil, Tach, Temp, Volt), Park Lights, Power Antenna, Power Door Locks, Power Windows, Radio/Clock (Constant & Switched), Starting, Tail & Third Brake Lights, Turn Signals, and Wipers.
Connections Included:
GM steering column turn-signal switch, two headlight pigtails, 10SI & 12SI alternator connectors, and dimmer switch.
Perfect For:
Custom or pro-touring 1947–1954 Chevy 3100/3600/3800 trucks running modern accessories or high-output alternators, while maintaining OEM-style fit and finish.
NOTE: 12-Volt Systems Only