12-Circuit Aftermarket Wiring Harness & 125 Piece Grommet Kit

Wiring Harness

Our universal wiring harness is the perfect solution for vehicles with no reproduction harness options, custom builds, or the budget-minded DIY builder. This compact hot rod wiring harness works with nearly any 12-volt vehicle, engine, and transmission combination (carb or EFI, automatic or manual), including engine swaps. This 12-circuit wiring harness is ideal for basic vehicles with minimal power accessories.

A compact fuse box mounts discreetly out of view, or choose an open installation for easy access. Harness consists of 4 branches that are strategically bundled to simplify installation. The 12-foot-long tail light leads allow easy mounting in most compact and mid-size vehicles.

Plug-and-Play with GM Tilt Columns

Wiring up the steering column controls can be a daunting task, but our harness makes it easy. This harness plugs directly into most GM-style tilt steering columns. It connects to aftermarket tilt columns from ididit, Flaming River or Speedway Motors, as well as factory GM tilt columns from 1968-1996 cars, trucks and vans (see our full list of compatible GM columns). If you’re sourcing a column from the junkyard, look for one with a flat “ribbon” plug, either 3-7/8” or 4-1/4” long (with 10 or more wires). Ignition switch plugs to connect “keyed” GM columns are also included in this kit.

Not using a GM tilt column? No problem. This harness easily splices into other steering columns with the included pin-out wiring diagram (it helps to have a wiring schematic for your vehicle here, too). Wires are conveniently bundled and labeled every 6 inches - just take your time and be attentive when splicing it in. 

Modern High-Quality Insulated Wire

Patches and splicing are tedious and unreliable. Your car deserves better! Start fresh with modern polyethylene-insulated, stranded bare copper wire. Each harness is constructed from premium quality GXL automotive wiring, with the appropriate wire diameter for each fused circuit (ranging 8 to 16 gauge). Every strand of this wire harness is covered with a high-temperature (-40°F to +257°F) outer coating, color coded, and labeled to aid in a smooth installation for any DIY enthusiast. In other words, you can expect the same quality of automotive wiring used by the big 3 OE manufacturers.

Modular Design with Modern Fuses

An innovative 2-piece fuse block design gives easy service, fuse replacement, and endless mounting solutions. Mount the baseplate and then clip in the fuse block assembly. The clip-in fuse block detaches easily for service and arrives complete with modern ATO/ATC blade fuses and a common 2-prong style flasher. No more fragile, corroded glass fuses! Crimp connectors and terminals are included to get you started right away.

Conveniently Bundled Wires

Our universal 12-circuit harness consists of 4 branches that are conveniently bundled, so you can get started right away. Here’s a quick rundown of those branches:

• Front of vehicle/engine feed wires (EFI engines will need an additional engine-specific harness)
• Dash panel instrument feed wires (mechanical or electric gauges)
• Ignition/lighting feed wires
• Rear of vehicle feed wires

The included 5-page instruction booklet, with color printed pictures, covers each of these pre-bundled circuits in detail.

 

Features

• Perfect for restoration projects, custom vehicles or budget-minded DIY builders
• Universal design for nearly any 12-volt vehicle – great for engine swaps!
• Plug-and-play with 1968-96 GM tilt steering columns (can be spliced into others)
• Connects directly to aftermarket tilt columns from Speedway Motors, ididit & Flaming River
• Works with nearly any engine/transmission combination (carb or EFI, auto or manual)
• Tail light leads are 12 ft. in length
• Constructed of GXL insulated, automotive-grade copper wiring
• High-temp polyethylene insulation makes it viable in engine compartments
• Includes appropriate wire diameter for each fused circuit (ranging 8 to 16 gauge)
• Compact 3.7” x 1.9” x 3.8” fuse block mounts discreetly out of view
• Two-piece fuse block design makes for easy fuse block removal/service
• Uses modern blade-style ATO/ATC fuses in place of outdated glass fuses
• 12 individually fused circuits, conveniently bundled into 4 “quick start” bales
• Each wire strand is color-coded and labeled every 6” for easy identification
• Complete wiring harness kit weighs less than 7.5 lbs. installed

Replacement Parts are available individually: Fusible Link, Headlight Switch, Dimmer Switch, Horn Relay, and a Fuse Block Repair Kit.

 

Grommet Kit

Grommets 

• 1/8" x 1/4"15 pieces
• 7/32" x 5/16"10 pieces
• 9/32" x 1/2"7 pieces
• 5/16" x 9/16"3 pieces
• 3/8" x 15/32"6 pieces
• 3/8" x 1/2"5 pieces
• 3/8" x 13/16"3 pieces
• 7/16" x 3/4"4 pieces
• 1/2" x 19/32"3 pieces
• 5/8" x 31/32"3 pieces
• 3/4" x 15/16"2 pieces

Rubber Plugs

• 9/32"     20 pieces
• 3/8"     20 pieces
• 1/2"10 pieces
• 5/8"5 pieces
• 3/4" 4 pieces
• 7/8" 3 pieces
• 1"2 pieces

 

12 Circuit Wiring Harness Installation Instructions (PDF)

Instructions for Matching with 910-62850 Turn Signal Switch (PDF)