Home / Shop / Painless Performance 27-Circuit Classic-Plus Customizable GM Truck Chassis Harnesses 20205 Wiring Harnesses, Harnesses, ATO/ATC Fuse Style, Front Fuse Block, Chevy, GMC, Kit

Painless Performance 27-Circuit Classic-Plus Customizable GM Truck Chassis Harnesses 20205 Wiring Harnesses, Harnesses, ATO/ATC Fuse Style, Front Fuse Block, Chevy, GMC, Kit

SKU: PRF20205

Wiring Harnesses

Painless Performance

Painless Performance 27-Circuit Classic-Plus Customizable GM Truck Chassis Harnesses 20205 Wiring Harnesses, Harnesses, ATO/ATC Fuse Style, Front Fuse Block, Chevy, GMC, Kit

SKU: PRF20205

Wiring Harnesses

IN STOCK! Est Ship 4-7 days. This item is IN STOCK at one of our warehouses or distribution centres, the ETA is the approximate time required to prepare your order for dispatch.

We accept

Description

Painless Performance 27-circuit Classic-Plus customizable GM truck chassis harnesses are designed to fit a wide range of trucks, Blazers, and Suburbans—whether C10, C20, or C30. They feature a factory-style bulkhead connector, allowing for easy mounting of the fuse block in the factory location, and have many factory connectors already installed on the harness out of the box. Each wire is custom-printed with the circuit identification, as well as using the GM color codes for easy installation. Wire your Squarebody once—and wire it right with these Painless 27-circuit Classic-Plus customizable GM truck chassis harnesses!

Additional features and benefits include:

* Each harness comes open-ended (headlight and taillight wiring) with extra length and can be paired with light socket kits (also available by Painless, but sold separately)
* Included connectors for: the headlight switch, dimmer switch, wiper motor, ignition switch, blower motor and switch, blower resistor, and instrument cluster

Part Type

73-87 GM P/U Wiring Harness 27 Circuit

Data: v4.2 - Upd: 2026-09-29 09:52:35

Specifications

Product Attributes - Brand: Painless Performance
Product Attributes - Manufacturer's Part Number: 20205
Product Attributes - Part Type: Wiring Harnesses
Product Attributes - Product Line: Painless Performance 27-Circuit Classic-Plus Customizable GM Truck Chassis Harnesses
Product Attributes - UPC: 749823202054
Product Attributes - Circuit Quantity: 27
Product Attributes - Ignition Key Location: Column
Product Attributes - Harness Length: Standard
Product Attributes - Fuse Block Included: Yes
Product Attributes - Fuse Block Location: Front
Product Attributes - Fuse Style: ATO/ATC
Product Attributes - Quantity: Sold as a kit.
Product Attributes - Notes: The number of circuits does not reflect the number of fuses; some circuits share the same fuse.

Reference Information

Brand Name/s	Painless Performance
StreetFX SKU	prf20205
SFX Item ID	5074386
Supplier Item Code	5074386
Manufacturer SKU	20205
Manufacturer UPC	749823202054
Alternative References	PWI20205, 27-Circuit

Compatibility

Application Data

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	4786
CID	292
Drivetrain	4WD
Ending Year	1973
Engine Family	CHEVROLET L6 GAS
Engine Size	4.8L/292
Engine Type	L6
Engine VIN Code	T
Liter	4.8
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	4786
CID	292
Drivetrain	RWD
Ending Year	1973
Engine Family	CHEVROLET L6 GAS
Engine Size	4.8L/292
Engine Type	L6
Engine VIN Code	T
Liter	4.8
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	5031
CID	307
Drivetrain	4WD
Ending Year	1973
Engine Family	Chevy small block Gen I
Engine Size	5.0L/307
Engine Type	V8
Engine VIN Code	X
Liter	5.0
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	5031
CID	307
Drivetrain	RWD
Ending Year	1973
Engine Family	Chevy small block Gen I
Engine Size	5.0L/307
Engine Type	V8
Engine VIN Code	X
Liter	5.0
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	7441
CID	454
Drivetrain	4WD
Ending Year	1973
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Engine Type	V8
Engine VIN Code	Z
Liter	7.4
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	7441
CID	454
Drivetrain	RWD
Ending Year	1973
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Engine Type	V8
Engine VIN Code	Z
Liter	7.4
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	4097
CID	250
Drivetrain	4WD
Ending Year	1974
Engine Family	CHEVROLET L6 GAS
Engine Size	4.1L/250
Engine Type	L6
Engine VIN Code	Q
Liter	4.1
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	4097
CID	250
Drivetrain	RWD
Ending Year	1974
Engine Family	CHEVROLET L6 GAS
Engine Size	4.1L/250
Engine Type	L6
Engine VIN Code	Q
Liter	4.1
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	4098
CID	250
Drivetrain	4WD
Ending Year	1974
Engine Family	CHEVROLET L6 GAS
Engine Size	4.1L/250
Engine Type	L6
Engine VIN Code	Q
Liter	4.1
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	4098
CID	250
Drivetrain	RWD
Ending Year	1974
Engine Family	CHEVROLET L6 GAS
Engine Size	4.1L/250
Engine Type	L6
Engine VIN Code	Q
Liter	4.1
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	4801
CID	292
Drivetrain	4WD
Ending Year	1974
Engine Family	CHEVROLET L6 GAS
Engine Size	4.8L/292
Engine Type	L6
Engine VIN Code	T
Liter	4.8
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	4801
CID	292
Drivetrain	RWD
Ending Year	1974
Engine Family	CHEVROLET L6 GAS
Engine Size	4.8L/292
Engine Type	L6
Engine VIN Code	T
Liter	4.8
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CID	350
Drivetrain	4WD
Ending Year	1974
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Engine Type	V8
Engine VIN Code	V
Liter	5.7
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CID	350
Drivetrain	4WD
Ending Year	1974
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Engine Type	V8
Engine VIN Code	Y
Liter	5.7
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CID	350
Drivetrain	RWD
Ending Year	1974
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Engine Type	V8
Engine VIN Code	V
Liter	5.7
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CID	350
Drivetrain	RWD
Ending Year	1974
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Engine Type	V8
Engine VIN Code	Y
Liter	5.7
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	7439
CID	454
Drivetrain	4WD
Ending Year	1974
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Engine Type	V8
Engine VIN Code	L
Liter	7.4
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	7439
CID	454
Drivetrain	4WD
Ending Year	1974
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Engine Type	V8
Engine VIN Code	Z
Liter	7.4
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	7439
CID	454
Drivetrain	RWD
Ending Year	1974
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Engine Type	V8
Engine VIN Code	L
Liter	7.4
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1973
CC	7439
CID	454
Drivetrain	RWD
Ending Year	1974
Engine Family	Chevy big block Mark IV
Engine Size	7.4L/454
Engine Type	V8
Engine VIN Code	Z
Liter	7.4
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	BASE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1987
CID	305
Drivetrain	4WD
Ending Year	1987
Engine Family	Chevy small block Gen I
Engine Size	5.0L/305
Engine Type	V8
Engine VIN Code	H
Liter	5.0
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	CUSTOM DELUXE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1987
CID	350
Drivetrain	4WD
Ending Year	1987
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Engine Type	V8
Engine VIN Code	K
Liter	5.7
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	CUSTOM DELUXE
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1987
CID	305
Drivetrain	4WD
Ending Year	1987
Engine Family	Chevy small block Gen I
Engine Size	5.0L/305
Engine Type	V8
Engine VIN Code	H
Liter	5.0
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	SILVERADO
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1987
CID	350
Drivetrain	4WD
Ending Year	1987
Engine Family	Chevy small block Gen I
Engine Size	5.7L/350
Engine Type	V8
Engine VIN Code	K
Liter	5.7
Make	CHEVROLET
Model	BLAZER
Region	USA
Submodel	SILVERADO
Wiring Harness Classification	Chassis Wiring Harness

Application Notes	27 Circuit Classic-Plus Customizable Chassis Harness; 27 Circuits; 18 Fuses w/Horn Relay; Bulkhead Connector Firewall Pass-Through; Supersedes From PN[10205]
Beginning Year	1978
CID	305
Drivetrain	RWD
Ending Year	1979
Engine Family	Chevy small block Gen I
Engine Size	5.0L/305
Engine Type	V8
Engine VIN Code	U
Liter	5.0
Make	CHEVROLET
Model	C10
Region	USA
Submodel	BIG TEN
Wiring Harness Classification	Chassis Wiring Harness

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Painless Performance 27-Circuit Classic-Plus Customizable GM Truck Chassis Harnesses 20205 Wiring Harnesses, Harnesses, ATO/ATC Fuse Style, Front Fuse Block, Chevy, GMC, Kit

Painless Performance 27-Circuit Classic-Plus Customizable GM Truck Chassis Harnesses 20205 Wiring Harnesses, Harnesses, ATO/ATC Fuse Style, Front Fuse Block, Chevy, GMC, Kit

Description

Part Type

Specifications

Reference Information

Compatibility

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