ARK AHI7 Inline ECU Harness Kit – 7 Pin Flat Socket, 1.5m Round Cable, Nite-Lite, LED Compatible (SKU: AHI7)

📘 What is Pulse Current and Why Does It Cause Trailer Light Issues?
In many modern vehicles—especially European brands like BMW, Mercedes, Volkswagen, and Audi—the electrical system is controlled by an advanced onboard computer. Instead of constantly sending power to the tail lights, these vehicles use something called “pulse current” (also known as pulsed voltage or PWM – pulse-width modulation).

This system sends quick bursts of electricity to check whether lights are functioning, instead of a steady power flow. It works fine for regular filament bulbs, but…

❌ LED trailer lights don’t like it.

⚠️ Note: ARK ECU harness kits are not suitable for vehicles using CANBUS systems, which require a different type of interface.

LEDs need a stable, constant current to operate properly. When they receive pulsed signals, they may:

Flicker randomly

Not turn on at all

Trigger dashboard errors

Cause warning lights or fault codes

That’s where problems start – your car thinks the trailer lights are broken, even when they’re not.

💡 How to Fix It?
To solve this issue, you need an ECU harness or a pulse-stabilising adapter, like the [ARK AHI7 Inline ECU Harness Kit].

This device: ✅ Converts pulse current into stable output
✅ Makes your trailer LED lights work smoothly
✅ Prevents dashboard flickers and error codes
✅ Installs easily with no rewiring or programming

🔧 Is Your Car Affected?
You might need an ECU harness if:

You drive a modern car (especially a European make)

Your trailer lights flicker or don’t work properly

You’re using LED trailer lights

Your dashboard shows “bulb out” warnings