I'm a big fan of bus bars; selling ATVs and SxS vehicles, we install a lot of them for the very reasons you mentioned.
On my golf cart, I installed the relay in the photo and it worked like a charm.
Appreciate the clarification & photo! I have a 3-wire (red/blk/ylw) to run through there.
@dtxlcfe Thank you for the note on the replacement grommets, as well!
I'd been trying to wire my Valentine One just under the mirror with a mirror mount. I assume the wiring behind(/above?) the mirror varies depending on trim & features.
Unlike users above, my RJ11 to red/black didn't match up with the white connector (mirror power) in the same red-to-red...