Unrivaled Customer Service
And Expert Tech Advice!  
Same Day Shipping Before 11 PM ET
My Cart
Shop By Vehicle
Shop By
Close Menu
Shop By Vehicle
Top Categories
All Categories

Top Categories

All Categories

Free Catalog
E-Mail Signup
My Account
Track Order
Gift Certificates

Painless Performance Products Universal Muscle Car 21-Circuit Classic Customizable Harness

Painless Performance Products 20103


made in usa
jegs shipping
FREE Shipping
Easy Returns
Easy Returns
Lowest Price Guarantee
Lowest Price Guarantee
Painless Performance Products Universal Muscle Car 21-Circuit Classic Customizable Harness $582.99
21-Circuit Classic Customizable Wiring Harness
  • Universal Muscle Car

  • Painless Performance Products 20103 Details

    Universal Muscle Car Wiring Harnesses

    This 21-Circuit Universal Muscle Car Harness can be used in just about any vehicle where basic wiring is needed. Many 1960s and 1970s GM, Ford and Chrysler vehicles utilize a square bulkhead connector to penetrate the firewall. This harness provides you a fuse block with this feature and the benefits of spade type fuses. Some firewall modification may be required depending on your application.

    • Number of Circuits: 21
    • Harness Length: Universal
    • Fuse Type: Blade & Maxi Fuse
    • Firewall Passthrough: Bulkhead Connector
    • Color Code Based: Universal
    • Circuit Designations: Printed on Wires

      This harness includes circuits for:

    • Headlight Switch- Power to headlight switch. Power wires out of headlight switch to head light dimmer switch, tail lights, dash lights and park lights.
    • Dimmer Switch wires include power from headlight switch and power out to low and high beam headlights.
    • Wiper Switch- Power to wiper switch. You will need to retain the wires between the wiper switch and your wiper motor.
    • Turn Signal Switch- Power into and out of your column mounted turn signal switch. Also included in this kit are both styles of GM turn switch connectors. Note: these will connect to most aftermarket and factory steering columns.
    • Ignition Switch- Power into and out of to fuse block (ignition, crank and accessory)
    • Brake Switch- Power into and out of brake switch. This includes a third brake light wire.
    • Courtesy Lights- Power and ground circuits for dome light activation.
    • Alternator- Charge wire and alternator field activation wires. (Most alternators can easily be wired up to this Painless harness). Included in kit is a high output alternator wire that allows you to use up to a 140 Amp alternator.
    • Horn- 40 Amp horn relay mounted to fuseblock
    • Radio- Harness includes constant B+ (for preset memory) and ignition hot circuits for any aftermarket or factory radio.
    • Starter- Crank signal wire for starter solenoid.
    • Engine section wires including electric choke, coil power, coil to tach signal, oil pressure, engine temperature, and A/C compressor clutch control wire.
    • Headlight section wires including right and left high and low beam headlights, turn signals and park lights.
    • Tail section wires including tail lights, brake lights, turn signal lights, fuel gauge sender, third brake light, and reverse lights.
    • Dash panel section wires including fuel, temperature, oil pressure, voltage, tachometer, speedometer, high beam and turn indicators and gauge illumination.
    • Also included in kit is a fuseblock mounting bracket, rubber grommet, 4-inch zip ties, 70 Amp maxi fuse and a large assortment of crimp style connectors.


    21 Circuit
    Circuit Quantity
    Fuse Block Included
    Fuse Block Location
    Fuse Style
    Ignition Key Location
    Sold as a kit
    Harness Length
    Manufacturer's Part Number:

    Can your electrical system handle the power demands of today's aftermarket add-ons? It can if it's Painless! These muscle car harnesses use the best thermal-crossed linked (TXL) polyethylene wire rated to 275 degrees at 600 volts (twice the voltage load of standard GPT wire). That's power on demand!


    • 21-Circuit Harnesses include circuits for Air Conditioning, Heat, Brake Lights, Ignition, Horn, Electric Fan, Emergency Flashers, Dash Instruments, Headlights, Radio, Turn Signals, Wipers, Dome Light, Tail Light, Backup Lights, Third Brake Light, Charging, Electric Choke and Starting.
    • 28-Circuit Harnesses include the above circuits plus Power Door Locks, Power Windows, Accessory Plug, Electric Fuel Pump, Backup Lights, Cruise Control, and Power Antenna.

    20103 is rated 4.0 out of 5 by 1.
    Rated 4 out of 5 by from Great product and quality I just started the install; if the product came w/ power braid it would make it better other wise great product
    Date published: 2017-09-21
    • y_2018, m_8, d_13, h_7
    • bvseo_bulk, prod_bvrr, vn_bulk_2.0.8
    • cp_1, bvpage1
    • co_hasreviews, tv_0, tr_1
    • loc_en_US, sid_10001_10001_96676, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
    • clientName_jegs
    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations