SON 2-Pole Connection for SON-Coaxial Cable - Connector Set Male & Female

I recommend this product

I needed to add a SON rear light to our tandem. ... the 1.9m supplied length of coax cable was to short,, so I had to add an extension piece ... Also if you have a bike with SnS connectors you may want to fit this, even if the cable length is OK.

Yes it requires soldering, Yes, it's fiddly to do and assemble. Once done however it's solid and reliable. It requires a good positive push to mate, but one done that sucker isn't going to come apart.

In addition to the heat shrink just to make it a bit more water proof, I used some Collinite 485 Insulating wax, just lightly smeared on the outside of the join.

I recommend this product

Good product and does the job perfectly, although the soldering of the wires can be a little fiddly, but the instructions are clear.

I recommend this product

My dynamo rear light became unreliable, sometimes on and then off without no obvious reason. So, I ripped out all the cableling and replaced it with Schmidt coaxial cable and a junction just behind the BB. Everything now works fine and the rear light is perhaps brighter than when new. I think the cabling will outlive the bike.