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Painless 10103 Pickup Truck Wiring Harness

Painless 10103 universal GM pickup truck wiring harness.

For applications with GM key in column steering columns.

Use in just about any pickup where basic wiring is needed with a GM steering column.

Suited for short beds, long beds and extended cabs.

Includes GM column mounted ignition switch plug and turn signal switch plug, pre-terminated and ready to install.

Number of Circuits: 12 Fuses w/ Horn Relay and Maxi Fuse

Harness Length: Universal

Fuse Type: Blade & Maxi Fuse

Firewall Passthrough: Grommet

Color Code Based: GM

Connectors Included: GM Steering Column Turn Switch and Ignition Switch, Dimmer Switch, Two Headlight Pigtails, 10SI & 12 SI Alternator, HEI Power and Tach and 20 Extra 56 Series Terminals for use with any Factory GM 56 Series Connector such as Headlight Switch, Wiper Switch or A/C Switch/Blower Motor.

Circuit Designations: Printed on Wires


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 fuse block

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.


right and left high and low beam headlights

turn signals

park lights


tail lights

brake lights

turn signal lights

fuel gauge sender

third brake light

reverse lights




oil pressure




high beam

turn indicators

gauge illumination


fuse block mounting bracket

rubber grommet

4 inch zip ties

70 Amp maxi fuse

large assortment of crimp style connectors

Most important of all an illustrated installation manual that equips you with the needed information to install the harness to your vehicle. If you get stuck during the installation just give the Painless Performance tech line a call. They have an immense data base of vehicle specific information.

Painless Wiring 10103 universal GM truck wiring harness key on column12 circuit PAINLESS-PERFORMANCE-10103
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