How to connect the car ACC wire?

[DavidMarie]

If there are only positive and negative two wires, then connect the negative to the negative terminal of the battery or to a screw on the car body. The following is a related introduction about ACC adaptive cruise: 1. Definition: The full English name of ACC is "Adaptive Cruise Control", which means "adaptive cruise control" in Chinese. The adaptive cruise control system is an intelligent automatic control system, which is developed on the basis of the already existing cruise control technology. 2. Function introduction: The adaptive cruise control system is an intelligent automatic control system, developed on the basis of the already existing cruise control technology. During vehicle driving, the distance sensor (radar) installed at the front of the vehicle continuously scans the road ahead, while the wheel speed sensor collects the vehicle speed signal. When the distance to the vehicle ahead is too small, the ACC control unit can coordinate with the anti-lock braking system and the engine control system to apply appropriate braking to the wheels and reduce the engine's output power, ensuring that the vehicle always maintains a safe distance from the vehicle ahead.

[Isabella]

The ACC wire connection is actually quite simple, as I learned from my DIY modification experience. First, locate the wiring harness near the car's ignition switch. The ACC wire typically carries power when the key is turned to the ACC position. Use a voltmeter to test and identify the wire that shows 12V—it might be red or yellow, but colors vary by vehicle, so checking the manual is best. Gather some tools: wire strippers, quick connectors, and heat shrink tubing, and disconnect the battery's negative terminal to prevent short circuits. Then, strip a small section of the ACC wire's insulation and connect it to your device, such as the ACC port of a dash cam, using a connector to ensure a secure fit. Test the functionality, and once confirmed, secure the wiring harness. Remember, the ACC wire only supplies power in the accessory position—avoid mistakenly connecting it to the constant BAT wire or IGN ignition wire, as this could drain the battery. The whole process takes about half an hour, but prioritize safety and don't rush.

[DamianMarie]

I often remind everyone to be careful when connecting the ACC wire during car repairs. The ACC is the accessory power line. Before wiring, always disconnect the car battery terminals to avoid short circuits that could cause a fire. Use a voltage tester to carefully check the wiring harness and confirm which wire has power when the key is in the ACC position—don't rely solely on wire colors as they can be misleading. After stripping the wire, use a crimping tool for a secure connection and insulate it properly to prevent loosening. The ACC wire has low power capacity and should only be used for low-power devices like audio systems or chargers—avoid connecting high-power equipment to prevent blown fuses. I've seen cases where reversed or shorted connections resulted in blown fuses or even damaged computer modules, so for beginners, it's best to seek help from a professional to ensure a stable and hazard-free circuit.

[LeDaniella]

As a beginner in car modifications, I found connecting the ACC wire wasn't as difficult as I thought. First, I turned off the engine and disconnected the negative battery terminal. Then, I located the wiring harness under the steering wheel and used a test light to verify which wire lit up when the key was in the ACC position. After exposing a small section of the wire insulation, I directly connected it to the device's input port (like the ACC terminal of a dash cam) and secured it with insulating tape. The whole process took about ten minutes, but I had to be careful not to touch other wires like the constant power line. After finishing, I tested the functionality - if the device powered on normally, the job was done. It's a straightforward process that doesn't require professional tools.