Wiring Color Reference

Common OEM wire color codes by manufacturer and system. Search by function or color.

SystemFunctionWire Color
PowerBattery + constantRed / Orange
PowerGroundBlack
PowerIgnition switched +12VPink
PowerAccessory +12VOrange
PowerStarter signal (S terminal)Purple/White
ChargingAlternator output (BAT)Red / Orange
ChargingAlternator field / senseBrown
IgnitionHEI module ignition feedPink
IgnitionCoil tach terminalWhite
IgnitionKnock sensor signalDk Blue/White
FuelFuel pump relay powerGray
FuelFuel pump groundBlack
FuelFuel level senderPurple
SensorsCoolant temp sensor (ECT)Yellow / Yellow/Black
SensorsO2 sensor signalPurple
SensorsMAP sensor signalLt Blue
SensorsTPS signalDk Blue
SensorsIAT sensor signalTan/Black
LightsHigh beamLt Green
LightsLow beamTan
LightsBrake light switchLt Green
LightsLeft turn / stop rearYellow
LightsRight turn / stop rearDk Green
LightsReverse lightsLt Blue
LightsPark / tail lightsBrown
AudioRadio constant +12VOrange
AudioRadio ignition +12VYellow
AudioRadio groundBlack
AudioRadio illuminationGray
AudioFront left speaker (+)Tan/White
AudioFront left speaker (−)Gray/White
AudioFront right speaker (+)Lt Green/White
AudioFront right speaker (−)Dk Green/White
AudioRear left speaker (+)Brown/White
AudioRear right speaker (+)Yellow/White

35 results

Always verify with a wiring diagram for your specific year, make, and model. Wire colors vary by year, trim level, and production run. This reference covers common conventions — never trust color alone when tracing safety-critical circuits (brakes, fuel, ignition).