Bill Smith
Founder, 1929-2014
Speedy Bill
Since 1952
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Chassis Wire Harnesses

Few things can be as frustrating - and challenging - on your build as the wiring process. Speedway Motors is here to help with easy to install Chassis Wire Harnesses. We offer a variety of circuit options from the best in the business like Painless & American Autowire. All kits include detailed instructions to help with the install. Want more help? No problem! Our award winning techinical staff will help you through the entire process to make sure you get the right harness and get it installed correctly on your ride.

"Painless Wiring Muscle Car, Chassis Wire Harnesses" Page 1 of 1

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  • Painless Wiring 20120 1964-1966 Mustang 22 Circuit Wiring Harness
    Painless Wiring 20120 1964-1966 Mustang 22 Circuit Wiring Harness
    (Part #91020120)
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    One thing to never forget - the wiring in your muscle car is forty years old and updating to modern and safe components is easy. Owners and restorers of 1964 to 1966 first generation Mustangs can take comfort in the fact that there is now an electrical system upgrade from Painless to completely rewire this classic car. These Painless wiring harnesses feature many pre-wired connections and are color coded to make installation a snap.

    This 22 circuit direct fit 1965-1966 Mustang harness has many of the factory connectors already installed on the harness out of the box.  This harness uses our unique covered micro-fuse block.  Also featured is an auxiliary circuit with 20 amp relay for accessories such as fog lights, or an electric fuel pump. Each wire is custom printed with the circuit identification as well as using Ford color codes for easy installation.  NOTE: THIS WILL NOT FIT 1964 1/2 MUSTANGS

    1964-1966 Mustang Wiring Instructions (PDF)

    Note: Some firewall modifications required.

  • Painless 10123 1966-1976 Ford Muscle Car 21 Circuit Wiring Harness
    Painless 10123 1966-1976 Ford Muscle Car 21 Circuit Wiring Harness
    (Part #91010123)
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    One thing to never forget - the wiring in your muscle car is forty years old and updating to modern and safe components is easy. These Painless wiring harnesses feature many pre-wired connections and are color coded to make installation a snap. This customizable 21 circuit harness can be used in almost any application where you want Ford color coded wires. This harness uses our unique covered micro-fuse block.  Also featured is an auxiliary circuit with 20 amp relay for accessories such as fog lights, or an electric fuel pump. Each wire is custom printed with the circuit identification for easy installation.

    Designed for 1966-1976 Ford muscle cars including Galaxie, LTD, Falcon, Fairlane, Mustang, Maverick, Torino, and Ranchero.

    NOTE: Will not work with Thunderbirds. 

    1966-1976 Ford Muscle Car Wiring Instructions (PDF)

  • Painless Wiring 20106 1955-57 Chevy 28 Circuit Wiring Harness
    Painless Wiring 20106 1955-57 Chevy 28 Circuit Wiring Harness
    (Part #91020106)
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    This 28 circuit kit is designed to fit the 1955-1957 "Tri-Five Chevy" and includes additional circuits for power options and accessories. This harness features a factory location Painless mounting plate for the fuse block, and special dash & turn signal connectors. Included with this harness you will also find pre wired plugs for the headlights and each wire is custom printed with the circuit identification as well as using GM color codes for easy installation. 

    1955-1957 Chevy Wiring Instructions (PDF)

  • Painless Wiring 20121 1967-1968 Mustang 22 Circuit Wiring Harness
    Painless Wiring 20121 1967-1968 Mustang 22 Circuit Wiring Harness
    (Part #91020121)
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    This 22 circuit direct fit 1967-1968 Mustang harness has many of the factory connectors already installed on the harness out of the box.  This harness uses our unique covered micro-fuse block.  Also featured is an auxiliary circuit with 20 amp relay for accessories such as fog lights, or an electric fuel pump. Each wire is custom printed with the circuit identification as well as using Ford color codes for easy installation.

    1967-1968 Mustang Wiring Instructions (PDF)

  • Painless Wiring 20107 1955-1957 Chevy  21 Circuit Wiring Harness
    Painless Wiring 20107 1955-1957 Chevy 21 Circuit Wiring Harness
    (Part #91020107)
    x
                

    This 21 circuit kit is designed to fit the 1955-1957 "Tri-Five Chevy". This harness features a factory location Painless mounting plate for the fuse block, and special dash & turn signal connectors. Included with this harness you will also find pre wired plugs for the headlights and each wire is custom printed with the circuit identification as well as using GM color codes for easy installation. 

    1955-1957 Chevy Wiring Instructions (PDF)

  • Painless Wiring 20122 1969-1970 Mustang 22 Circuit Wiring Harness
    Painless Wiring 20122 1969-1970 Mustang 22 Circuit Wiring Harness
    (Part #91020122)
    x
                

    This 22 circuit direct fit 1969-1970 Mustang harness has many of the factory connectors already installed on the harness out of the box.  This harness uses our unique covered micro-fuse block.  Also featured is an auxiliary circuit with 20 amp relay for accessories such as fog lights, or an electric fuel pump. Each wire is custom printed with the circuit identification as well as using Ford color codes for easy installation.

    1969-1970 Mustang Wiring Instructions (PDF)

  • Painless 20101 1967-1968 Camaro/Firebird 24 Circuit Wiring Harness
    Painless 20101 1967-1968 Camaro/Firebird 24 Circuit Wiring Harness
    (Part #91020101)
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    One thing to never forget - the wiring in your muscle car is forty years old and updating to modern and safe components is easy. These Painless Wiring harnesses feature many pre-wired connections and are color coded to make installation a snap. Instructions included.

    This 24 circuit harness is designed for the 1967 and 1968 Camaro & Firebird. It uses a '69 and newer style bulkhead connector design along with blade fuses and enough circuits to wire up just about any installed upgrade to your 1st generation F-body. Some minor bulkhead modification required. Factory original quick connect terminals are included for the in dash printed circuit board.  Pre-terminated plugs for a column mounted ignition switch, dimmer switch, headlights & headlight switch, blower motor, wiper motor, and turn signal switch. Included with this harness you'll also find a detailed manual and each wire is custom printed with the circuit identification as well as using GM color codes for easy installation. 

    1967-1968 Camaro/Firebird Wiring Instructions (PDF)

  • Painless Wiring 20104 Universal 28 Circuit Wiring Harness for Muscle Cars
    New
    Painless Wiring 20104 Universal 28 Circuit Wiring Harness for Muscle Cars
    (Part #91020104)
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                Please view the product's page for more information
            
  • Painless Wiring 10220 28 Circuit Remote Trunk Harness
    Painless Wiring 10220 28 Circuit Remote Trunk Harness
    (Part #91001020)
    x
                Please view the product's page for more information
            
  • Painless Wiring 50003 Universal 21 Circuit Pro Street Chassis Wiring Harness
    New
    Painless Wiring 50003 Universal 21 Circuit Pro Street Chassis Wiring Harness
    (Part #91050003)
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    This 21 circuit wiring harness from Painless Performance is for your Pro Street Chassis and includes an optional connector if you want to use a GM column mounted ignition switch. The included switch panel is a roll bar mount 8 switch rocker panel. This panel is pre-wired and is a direct plug and play into this harness. This harness kit also comes with a Painless mounting plate, grommets, terminal assortment kit, and the necessary connectors for your turn signal switch, headlights, and alternator. All wires are custom printed with the circuit identification as well as using GM color codes for easy installation. Made in the USA!

    Installation Instructions (PDF) 

    This harness includes these circuits:

    • Accessory #1
    • Accessory #2
    • Brake Lights
    • Charging
    • Dome Light
    • Electric Fuel Pump #1 
    • Electric Fuel Pump #2 
    • Electric Water Pump 
    • Emergency Flashers
    • Fan Relay Activation Power
    • Fused Power Source
    • Headlights
    • Horn
    • Ignition Coil
    • Park Lights
    • Radio and Gauges
    • Starting
    • Tail Lights
    • Third Brake Light
    • Turn Signals
    • Wipers

     

     

  • Painless 20110 1966-1967 Chevy II/Nova 21 Circuit Wiring Harness
    Painless 20110 1966-1967 Chevy II/Nova 21 Circuit Wiring Harness
    (Part #91020110)
    x
                

    One thing to never forget - the wiring in your muscle car is forty years old and updating to modern and safe components is easy. These Painless Wiring harnesses feature many pre-wired connections and are color coded to make installation a snap. Instructions included.

    This 21 circuit customizable Chevy II/Nova harness has many of the factory connectors already installed on the harness out of the box. Including: the headlight connectors & switch, fuel gauge connnector, dimmer switch, brake switch, heater switch, blower resistor, wiper switch, backup switch, horn, dash light sockets, and warning light sockets. This harness is split into three sections (engine, dome light, & rear) for easy installation and troubleshooting. You'll also find in this kit a harness for the factory air, a high output alternator pigtail with the connector installed, two door jam switches, 12 instrument panel light bulbs, eight harness mounting clamps, a custom Painless mounting plate for the fuse block, and each wire is custom printed with the circuit identification as well as using GM color codes for easy installation.

    1966-1967 Chevy II Nova Wiring Instructions (PDF)

  • Painless 10127 1966-1976 Mopar Muscle Car 21 Circuit Wiring Harness
    Painless 10127 1966-1976 Mopar Muscle Car 21 Circuit Wiring Harness
    (Part #91010127)
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    One thing to never forget - the wiring in your muscle car is forty years old and updating to modern and safe components is easy. This Painless Wiring harness features many pre-wired connections and is color coded to make installation a snap. This customizable 21 circuit harness can be used in almost any application where you want Mopar color coded wires. This harness elimintes the troublesome bulkhead connector and uses our unique covered micro-fuse block. Also featured is an auxiliary circuit with a 20 amp relay for accessories such as fog lights, or an electric fuel pump. Each wire is custom printed with the circuit identification for easy installation. 

    Designed for 1966-76 Chrysler/Mopar muscle cars including Baracuda, Imperial, Belvedere, Satellite, Charger, GTX, Dart, Road Runner, Challenger, Demon and Duster. 

    1966-1976 Mopar Muscle Car Wiring Instructions (PDF)

     

     

  • Painless Wiring 20103 21 Circuit Universal Wiring Harness for Muscle Cars
    New
    Painless Wiring 20103 21 Circuit Universal Wiring Harness for Muscle Cars
    (Part #91020103)
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    This 21 circuit kit from Painless Performance will fit your 1960's, 70s, or 80s GM, Ford, and Chrysler muscle cars where a bulkhead connector is required. Some minor bulkhead modification may be required. Made in the USA!

    Installation Instructions (PDF) 

    Included with this harness are the following parts:

    • GM turn signal & column mounted ignition switch connectors
    • Pre-wire plugs for the headlights & dimmer switch
    • Custom printed wiring with the circuit identification as well as using GM color codes for easy installation

    This harness includes circuits for:

    • A/C & Heat
    • Accessory
    • Backup Lights
    • Brake Lights
    • Charging
    • Dome Light
    • Electric Choke
    • Emergency Flashers
    • Fan Relay Activation Power
    • Fused Power Source
    • Headlights
    • Horn (Relay)
    • Ignition Coil
    • Instrument Panel Lighting and Gauges (Fuel Gauge, Oil Gauge, Tachometer, Temperature Gauge, and Voltmeter)
    • Park Lights
    • Radio/Clock (Constant and Switched) 
    • Starting
    • Tail Lights
    • Third Brake Light
    • Turn Signals
    • Wipers

     

  • Painless Wiring 50002 Universal 21 Circuit Pro Street Chassis Wiring Harness
    New
    Painless Wiring 50002 Universal 21 Circuit Pro Street Chassis Wiring Harness
    (Part #91050002)
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    This 21 circuit wiring harness from Painless Performance is just what you need for your street chassis. This harness includes an optional connector if you want to use a GM column mounted ignition switch. It also has a terminal assortment kit, with the necessary connectors for your turn signal switch, headlights, and alternator. Each wire is custom printed with the circuit identification as well as using GM color codes for easy installation. Made in the USA!

    Installation Instructions (PDF) 

    This harness includes these circuits:

    • Accessory #1
    • Accessory #2
    • Brake Lights
    • Charging
    • Dome Light
    • Electric Fuel Pump #1 
    • Electric Fuel Pump #2
    • Electric Water Pump 
    • Emergency Flashers
    • Fan Relay Activation Power
    • Fused Power Source
    • Headlights
    • Horn
    • Ignition Coil
    • Park Lights
    • Radio and Gauges B+ (Fuel Gauge, Oil Gauge, Tachometer, and Temperature Guage)
    • Starting
    • Tail Lights
    • Third Brake Light
    • Turn Signals
    • Wipers