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Discussion Starter · #1 ·
I have separate amber, stop, and normal lights.
I'm having trouble finding the brake and normal lights in this circuit.
I found left and right turn as they pulse.
However, the yellow wire actually goes off when I press the brake pedal.
The blue and black always seem to on even when I take the ignition key out.
Any ideas how to troubleshoot?
V70 trailer wiring https://imgur.com/gallery/ECyyZw2
 

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You don't mention what year.
Here's what help I can give; previous owner did this, and I've never used it, but I know he towed a trailer, so I assume it works correctly:
Here are the splices he used for Left side turn and brake and not sure what the 3rd one is.. Green with speckled black? Orange with red stripe and solid green. The harness he used came with a ground tap, you can see it at the bottom, and for positive power it hooked right up to the battery (which is right next to the spare in MY '04.)

There are 2 green wires there; he apparently cut into one and that wasn't right, so he taped it up and tried again (or thought it was for the right)
Here's the right:

Green with white stripe. Again, there are two. I don't know why. If you have a harness and a meter shouldn't be hard to figure out, though.
 
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