and Performance Parts and Accessories

Product #: 10413
Arriving Soon!
1968-up GM; Painless Wiring; 25-Circuit Wiring Harness Assembly; Universal Fit GM
The Painless Pro Series gives you everything you need to wire up your pro-touring or custom ride right the first time! Ample length is provided for each circuit, providing you the freedom to route and hide your wiring how you choose. Once you've got the harness fit how you like it, included are over 25 GM factory style connectors found on most '60s to early '90s GM switches, allowing you to turn the Pro Series harness into a direct fit harness for your application. LED ATC bladed fuses get you away from the old hard-to-find glass fuses, and will light up if blown making troubleshooting a painless task. The 6 gauge charge wire and midi fuse (no more problematic fusible link!) will keep up with today's high amperage alternators, and the provided front and rear ground harnesses making grounding your lighting circuits a breeze! Provided with many GM connectors and terminal, insulated and non-insulated butt splices, heat shrink, grommets, cable ties, ground straps, and cable tie clips, the Pro Series brings a new meaning to truly Painless wiring and includes our lifetime guarantee.
This harness features a GM Bulkhead style firewall pass through with the fuse block mounted inside the vehicle on the firewall, the exact same connector GM used on many vehicles from 1968-up. The wires are pre-terminated using Packard factory crimping machines and utilize a bulkhead to mount to and pass through the firewall, keeping your wiring safe and protected and allowing you to easily disconnect the firewall forward wiring without having to remove wiring from each individual component. Each wire is extra length with up to 20' of length to the front and over 25' to the rear providing ample length for mounting your fuse block and freedom to route the wiring how you choose. After trimming to fit, utilize the provided terminals & connectors to terminate the ends.
This harness comes with a pre-terminated GM Column Mounted Ignition switch connector, allowing you to simply plug into GM keyed and many aftermarket columns that utilize the GM keyed ignition switch!
Installation Instructions: Download Here
Included with the GM Pro Series harnesses is:
- Assortment of insulated and non-insulated splices, ring terminals, heat shrink, grommets, cable ties, and cable tie clips.
- (2) Turn signal connectors- fits connectors found on factory GM hard wired turn signals
- (4) H4 Headlight connectors- to support single (high/low) or dual headlights (separate high beams)
- (4) Molded ¼ sockets for front & rear marker lights
- (2) HEI distributor connectors (+ and Tach)
- (2) Connectors for factory GM wiper motor
- GM washer pump connector
- Courtesy light sockets
- GM headlight switch connector
- GM dimmer switch connector
- GM brake switch connector
- GM turn signal switch flat connectors (early & late)
- GM ignition switch connectors (on GM keyed column harnesses)
- Reverse Switch connector (column mounted or factory floor shifter mounted)
- Braided ground straps (for body and core support to frame grounding, also includes (6) self-tapping ¼” screws for mounting)
- Alternator bag kit with terminals, splices, resistor, diode to connect the alternator. (1) Connector for GM 10si alternator
25 Circuit Harnesses Feature: Slightly Larger Fuse Block Adds Power Window and Power Lock Support. 18 Total Fuses Support 25 Total Circuits, giving more components their own dedicated circuit.
This harness includes circuits for:
- A/C & Heat
- Accessory (Fan Relay Activation, etc.)
- Backup Lights
- Brake Lights
- Charging
- Cigarette Lighter
- Dome / Courtesy Lights
- Electric Choke
- Electric Fuel Pump
- Emergency Flashers
- Fused Power Source
- Grounds – Front and Rear Lights
- Headlights
- Horn (Relay)
- Ignition Coil
- Instrument Panel Lighting and Gauges*
- Park / Marker Lights
- Power Door Locks
- Power Windows
- Radio/Clock (Constant and Switched)**
- Starting
- Tail Lights / License Plate Light
- Third Brake Light
- Turn Signals
- Wipers / Washer Pump
* Including Wires For;
- Fuel Gauge
- Oil Gauge
- Tachometer
- Temperature Gauge
- Voltmeter
** Includes:
- Amp Activation Wire
This product fits the following vehicle applications. Click to view individual years.

Buick Apollo 1973-1975
Buick Centurion 1973-1973
Buick Century 1973-1975
Buick Electra 1968-1975
Buick Estate Wagon 1973-1975
Buick LeSabre 1968-1975
Buick Regal 1973-1975
Buick Skyhawk 1975-1975
Buick Skylark 1975-1975
Buick Wildcat 1968-1968
Chevrolet Bel Air 1968-1975
Chevrolet Biscayne 1968-1968
Chevrolet Camaro 1968-1975
Chevrolet Caprice 1968-1975
Chevrolet Chevy II Nova 1968-1968
Chevrolet Corvette 1968-1975
Chevrolet G10 1975-1975
Chevrolet G10 Van 1968-1968
Chevrolet G20 1975-1975
Chevrolet G20 Van 1968-1968
Chevrolet G30 1975-1975
Chevrolet Impala 1968-1975
Chevrolet K5 Blazer 1975-1975
Chevrolet LUV 1975-1975
Chevrolet Monza 1975-1975
Chevrolet Nova 1969-1975
Chevrolet Truck 1968-1975
Chevrolet Vega 1975-1975
GMC G15 1975-1975
GMC G15/G1500 Van 1968-1968
GMC G25 1975-1975
GMC G25/G2500 Van 1968-1968
GMC G35 1975-1975
GMC Jimmy 1975-1975
GMC Truck 1968-1975
Oldsmobile 98 1968-1975
Oldsmobile Custom Cruiser 1975-1975
Oldsmobile Delmont 88 1968-1968
Oldsmobile Delta 88 1968-1975
Oldsmobile Omega 1975-1975
Oldsmobile Starfire 1975-1975
Oldsmobile Toronado 1968-1975
Oldsmobile Vista Cruiser 1975-1975
Pontiac Acadian 1968-1968
Pontiac Astre 1975-1975
Pontiac Catalina 1968-1968
Pontiac Firebird 1968-1975
Pontiac Grand Am 1975-1975
Pontiac Grandville 1975-1975
Pontiac Laurentian 1968-1968
Pontiac Parisienne 1968-1968
Pontiac Strato-Chief 1968-1968
Pontiac Ventura 1971-1975
Shipping Dimensions
- Weight: 18 Lbs
- Dimensions: 16" x 11" x 7"
- Freight Type: Standard
Special Order Information
Special order items are items that are made specifically to your desired product specifications.
Because these products are produced especially for you, special orders must be prepaid in full and are non-returnable.
Contact us during normal business hours to place your order.
Drop Ship Information
Dropship items are non-stocking items that are shipped directly from our supplier to you. We are able to reduce transit time and speed up delivery by shipping these items directly to you. Dropship items are not available for pickup in our warehouse showroom.
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