Hi guys, 


Anybody fitted towing electrics to w164?

I have plugged into rear Sam unit, the 2 fused connections and the ground, had Mercedes code it and after hooking up to trailer board I have no lights. Any ideas please?


You have to check if you used to correct parts.

If you are having problems after using newly bought pars, it can either be a


1. Faulty Part

2. Part is okay but is not made for your car

3. Part if okay and fits your cars, your car's own electrics are fused.

4. You are installing it correctly


Please go through these steps one by one to figure this out.

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