| Position | Circuit / Function | Amp Rating | Description | | :--- | :--- | :--- | :--- | | | Turn Signals | 20A | Controls the left and right turn signal flashers. | | 2 | Backup Lights | 15A | Powers the reverse lights when the transmission is in reverse. | | 3 | Stop / Brake Lights | 20A | Powers the brake lights at the rear of the cab and trailer connection. | | 4 | Horn | 20A | Powers both the city horn and the air horn solenoid (if equipped). | | 5 | Heater / A/C Blower | 25A | Powers the fan motor for the HVAC system. | | 6 | Cigarette Lighter / Accessory | 15A | Powers the cigarette lighter and often the radio memory/power. | | 7 | Wiper / Washer | 20A (Breaker) | Often a circuit breaker. Powers the windshield wiper motor and washer pump. | | 8 | Instrument Cluster | 10A | Powers the gauges (speedometer, fuel, voltmeter) and warning lights. | | 9 | Dome / Cargo Light | 15A | Interior cab lighting and optional cargo area lighting. | | 10 | Headlight High Beam | 20A | Specifically for the high beam headlight circuit. | | 11 | Headlight Low Beam | 20A | Specifically for the low beam headlight circuit. | | 12 | Park / Marker Lights | 20A | Front and rear running lights, side markers, and license plate light. | | 13 | Radio / Stereo | 10A | Powers the aftermarket or factory-installed radio. | | 14 | Dash Lights | 10A | Illumination for the dashboard gauges and switches. | | 15 | ECM / Engine Control | 10A or 15A | Powers the Engine Control Module (computer). Do not remove while running. | | 16 | Cruise Control | 10A | Powers the cruise control servo and dashboard switch. | | 17 | Fuel Heater | 15A | (Cold weather models) Powers the heating element in the fuel filter/water separator. | | 18 | ABS Power | 20A | Powers the Anti-lock Braking System module. | | 19 | Accessory Power | 20A | Often used for additional equipment or 12V power points. | | 20 | Starter Solenoid | 10A | Signal wire to the starter solenoid. | Desifakes Hot | Kollywood