Real Shop Experience, Real Wiring Decisions
At a Glance
A classic truck wiring harness is one of the most important choices in any F100 or F250 build. This guide compares four popular harness options—from $549 universal kits to fully integrated systems over $1,480. We’ll show you which harness fits stock trucks, which one handles modern Coyote/Godzilla swaps, and how long each one really takes to install.
Why Wiring Stops So Many Builds
Wiring is where many classic truck projects stall. Not because builders aren’t capable—but because wiring is a different discipline entirely.
Most harness kits look simple in the box. But “simple” can turn into weeks of work if you pick the wrong one.
Here are the four harnesses we install weekly:
- Coach Controls Coupe-23
- American Autowire Highway 22 Plus
- American Autowire Classic Update
- Fat Fender Garage Wire Harness System
Coach Controls Coupe-23
Price: $549
Fits: Universal
Type: Relay-based
What’s in the Box
- 23 labeled circuits
- Relay-based power center
- Clear schematics
- You cut & crimp everything
Pros
Total routing freedom. Modern architecture.
Cons
Not plug-and-play. Not weather-sealed. Several weeks of install time.
Best For
Budget builders who enjoy DIY wiring.
American Autowire Highway 22 Plus
Price: $712
Fits: Universal
Type: Traditional fuse panel
| Feature | Coupe-23 | Highway 22 Plus |
|---|---|---|
| Power System | Relay-based | Fuse box |
| Price | $549 | $712 |
| Best For | Modern restomods | Traditional builds |
Pros
Familiar old-school fuse panel feel.
Cons
Doesn’t handle high-power accessories as well as relay systems.
Best For
Builders who prefer traditional wiring.
American Autowire Classic Update
Price: $1,138
Fits: 1967–72 Ford
Type: Vehicle-specific
What Makes It Easy
- Made for your exact truck
- Pre-terminated connections
- Includes new switches
- Mounts in stock fuse-box location
Not Compatible With
Coyote or Godzilla swaps.
Best For
Stock restorations only.
Fat Fender Garage Harness
Price: From $1,480
Fits: 1967–72 Ford
Type: Relay-based modular
How It Works
- Pre-loomed front/rear harnesses
- Bulkhead connectors
- Sealed Metri-Pack connectors
- Relay-based power center
- Expandable architecture
- Built for Coyote/Godzilla integration
Best For
Coyote/Godzilla swaps and modern restomods.
Install Time Comparison
| Harness | Install Time | Skill Level |
|---|---|---|
| Coupe-23 | Several weeks | DIY |
| Highway 22 Plus | Several weeks | DIY |
| Classic Update | 1–2 weeks | Beginner |
| FFG Harness | A few days | Any level |
Which Harness Should You Pick?
Stock Trucks
- Classic Update
- Coupe-23
Restomods
- Coupe-23
- Highway 22 Plus
Coyote/Godzilla Swaps
- Fat Fender Garage Harness
Builder’s Tip: The cheapest harness isn’t always the cheapest choice. A $549 kit that takes six weeks to install costs you something too—your time.
Classic Truck Wiring Harness Comparison
| Feature | Coupe-23 | Highway 22 Plus | Classic Update | FFG Harness |
|---|---|---|---|---|
| Price | $549 | $712 | $1,138 | From $1,480 |
| Fits | Universal | Universal | 1967–72 Ford | 1967–72 Ford |
| Power System | Relay-based | Fuse box | Stock style | Relay-based modular |
| Install Time | Weeks | Weeks | 1–2 weeks | Days |
| Swap Compatible? | With work | With work | No | Yes |
| Weather-Sealed? | No | No | No | Yes |
| Expandable? | Limited | Limited | No | Yes |
| Best For | Budget DIY | Traditional | Stock | Modern swaps |
What's the best wiring harness for a Coyote swap?
The Fat Fender Garage harness is built specifically for Coyote swaps in 1967–72 Ford trucks. It integrates with modern engine management and installs in days instead of weeks.
Can I use the Classic Update for a Godzilla swap?
No. The Classic Update is designed for stock engines only and cannot support modern modular engines like the 7.3L Godzilla.
How long does installation take?
Universal kits take several weeks because you build the entire system. The FFG harness installs in a few days because the heavy lifting is already done.
Do I need weather‑sealed connectors?
Daily drivers benefit from sealed connectors to prevent corrosion. The FFG harness uses sealed Metri‑Pack connectors where they matter most.
Ready to Wire Your F100 the Right Way?
Your classic truck’s electrical system doesn’t have to be the project killer. Pick the harness that fits your build and get it wired right the first time.
Fat Fender Garage exists to redefine the classic vehicle experience. We design and build industry‑leading chassis, interiors, parts, and full builds that merge heritage with innovation.
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