towbar electrics

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    Power for bypass relay W246 B180CDI

    Hello all - new here and first post! Just purchased a 2013 B180 Diesel Sport with the 1.5 diesel, and I am going to add a tow bar this weekend. I am not going to use a dedicated wiring kit, but will use a SMART by-pass 7 way relay. My question is, what can I connect to for my main power supply...

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