Product Summary

73-87 Chevy, 73-87 GMC, 27 Number of Circuits

  • It is customizable to fit your projects needs
  • Specifically designed to fit the 1973-1987 GMC/Chevy trucks
  • Features a factory style bulkhead connector that allows for easy mounting of the fuse block
  • Kit comes with many of the factory connectors already installed on the harness out of the box
  • Each wire is custom printed with the circuit identification as well as using GM color codes for easy installation
See more details

Key Specs

MFG. Part #20205
Number of Circuits27
Fuse Block IncludedYes
Compatible with GM ColumnYes
Ignition Key LocationColumn
See more specs

Need To Know

Quick and Easy Returns

Return Policy

Painless Wiring 20205 Details

This 27 circuit 1973-1987 GMC/Chevy Painless wiring harness was designed to fit the trucks, Blazers, and Suburbans, whether C10, C20, or C30. It features a factory style bulkhead connector, allowing for easy mounting of the fuse block in the factory location, and has many of the factory connectors already installed on the harness out of the box. Including: the headlight connectors & switch, dimmer switch, wiper motor, ignition switch, blower motor & switch, blower resistor, and instrument cluster. Each wire is custom printed with the circuit identification as well as using GM color codes for easy installation.  Wire your Squarebody once and wire it right with Painless!

  • Customizable To Fit Your Projects Needs
  • Every Wire Has Its Function Printed On It Every Few Inches
  • Pre-Grouped Wire Sections
  • Comprehensive Instructions And Tech Support 

Includes:

  • Headlight connectors & switch
  • Dimmer switch
  • Wiper motor
  • Ignition switch
  • Blower motor & switch
  • Blower resistor
  • Instrument cluster 

Features

Harness includes circuits for: 

  • A/C & Heat
  • Accessory / Camper Cover Light
  • Accessory / Cigarette Lighter
  • Accessory / Four Wheel Drive Switch
  • Backup Lights
  • Brake Lights
  • Charging
  • Cruise Control
  • Dome and Courtesy Lights
  • Electric Choke
  • Electric Fuel Pump
  • Emergency Flashers
  • Fan Relay Activation Power
  • Fused Power Source
  • Headlights
  • Horn (Relay)
  • Ignition Coil
  • Instrument Panel Lighting and Gauges (Brake Warning Light, 4-Wheel Drive Light, Fuel Gauge, Oil Gauge, Speakers, Tachometer, Temp. Gauge)
  • Park Lights
  • Power Door Locks
  • Power Windows
  • Radio/Clock (Constant and Switched) (Brake Warning Light, 4-Wheel Drive Light, Fuel Gauge, Oil Gauge, Speakers, Tachometer, Temp. Gauge)
  • Starting
  • Tail Lights
  • Third Brake Light
  • Turn Signals
  • Wipers and Washer Pump

Application

  • 1973-1987 Chevrolet or GMC Pickup, Blazer, Suburban

     

Charts

Specs

Application/Specs:

  • Number of Circuits: 27 Circuits - 18 Fuses w/ Horn Relay & Maxi Fuse
  • Harness Length: Factory Fitment
  • Fuse Type: Blade & Maxi Fuse
  • Firewall Pass through: Bulkhead Connector
  • Color Code Based: Factory GM
  • Circuit Designations: Printed on Wires
  • Year: 1973 - 1987 
  • Make: Chevrolet or GMC
  • Model: C & K Truck/SUV
  • Engine: Non Fuel Injected
  • Transmission: Non Electronic

Painless Wiring 20205 Specifications

KEY SPECS
MFG. Part #20205
BrandPainless Wiring
Number of Circuits27
Fuse Block IncludedYes
Compatible with GM ColumnYes
Ignition Key LocationColumn
GENERAL
Fuse StyleATO/ATC
Harness LengthStandard
Sold in QuantityKit
NotesIncludes wiring harnesses, all connectors, brackets, flashers, and zip ties.
GTIN Code749823102057

Ratings & Reviews

5

5 Reviews

Overall Assessment

Customers highly recommend the Painless kit for vehicle rewiring, praising its practicality and quality. It makes challenging tasks easy, even for first-timers. The comprehensive kit includes everything needed, but users advise to read the instructions carefully. Users consistently remarked the material quality and noted that the harness effectively improved their vehicle's electrical systems. The product stands out as an exceptional solution versus competitors in terms of usability and safety.

5

5 reviews

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What a great wiring harness

5.0

2 years ago

TBone

Georgia

Verified

If you need to rewire your vehicle, Painless is the way to go. Great quality and amazing instructions.

Would Recommend

Product was straightforward and simple, shipping was fast

5.0

2 years ago

Matt

Kennewick, wa

Product was as described, easy simple instructions, shipping was faster than expected, happy overall with purchase

Would Recommend

Painless products are great and easy to install

5.0

3 years ago

Buster

Texas

Verified

Makes a difficult job fairly easy

Would Recommend

First time to ever rewire a vehicle!

5.0

3 years ago

DB

Wickenburg AZ

My wire harness in my truck was hacked up for years and I couldn't make sense of anything . I bought this Painless kit followed the step by step directions . Put in a couple of hours a night after work paid attention to detail used the classic braid loom . Introduced power to the new harness and my truck didn't burn to the ground . Everything on the truck that is electric works now . Good product !

Would Recommend

I would buy this product again

5.0

4 years ago

Bill

Kearny Arizona

Verified

Great wiring harness everything is included, but read the instructions. Don't expect to do it in a weekend

Would Recommend

Showing 5 of 5 reviews

Questions & Answers

3 Questions • 3 Answers

Does this wiring harness support the use of dual fuel tanks in the old square bodies?

by Shrek

• 2 years ago

1 answer

Will the tail lights and license plate light reach on a long box?

by Aden

• 4 years ago

1 answer

Will this harness work for a 1978 k30 chevy crew cab pickup. Power windows and locks on all doors.

by Andy Zeff

• 7 years ago

1 answer

3 of 3 questions shown

Fitment

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LG3 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 LG3 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 2-Piece Rear Main Chevy 350

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • 250 Chevy Turbo-Thrift 6 I6

  • Gen 1 L14 Small Block Chevy

Customer Impersonation Script