[Wideboy]

Fitted a removable tobar to my 3 series Tuesday night and planned on hooking up the electrics this evening but I was wondering if someone more clued up in electrics could answer me something.

I have a 7 pin single plug as I shall be only towing a trailer so I only need to operate lights ect. my intention was to tap into the electrics on the back of the car... I.e. trailer drivers side brake light into the cars drivers side brake light ect... you get the jist.

Whilst looking up on Google people on different forums are saying stuff about needing a relay or a bmw towing module. I was under the impression a relay was only needed if you were towing a caravan ect to operate fridge and charge the battery ect.

Also have my buzzer to wire in for the indicators

What will happen if I just tap into the lights on the back of the car?

Love from Gav, confused in southampton.