My octavia was fitted with a towbar twin electrics had a permanent live feed to boot for the fridge and other stuff. Where is this live feed picked up from as was using live feed to power a 12v plug but has stopped working fuse is ok boot end but not sure where at the front end feed is took from or if it has another fuse

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It all depends who fitted the towbar in first place,

 

When i wired my bypass relay unit in i took power from fusebox under dash behind headlight switch,

 

I fused it in fuebox and then ran it to back of car to bypass relay, i would start there

I will have a look there I kno it's Def not fed direct from the battery and I kno some cars have a wire that you connect to that's been solely fitted for the feed

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