- Busch and Müller Lumotec IQ Cyo Premium T Senso Plus Front Headlamp (Dynamo)

- Busch and Müller Toplight Line Brake Plus Rear Brake Light (Dynamo)

I am wiring my taillight separately but in parallel with my headlight so the taillight stays on even if I turn off the headlight. I'm doing this for USB powerbank charging purposes.

It is a B&M headlight and taillight. The instructions say to use the positive/negative wires when connecting the taillight to the headlight. The taillight has positive and negative terminals and I read of some people having issues if they didn't connect it properly to the headlight.

So, basically I am just wiring it directly to the hub which doesn't have positive/negative. Do I need I need to do anything special or does it not matter?

IMHO, it depends on which hub you are using. SP, Shimano, and Sanyo usually incorporate a frame ground for one terminal. Personally I wire all my dynamos the same regardless of make. The positive/+, if the terminals are on the right side of the bike, will be the rear/left spade. The solid black wire from the cyo is the positive/+. Looking at the back of the B&M rear light, the positive/+ will be on the right/left side of the bike. Never had a problem wiring it this way and I don't have to think about it if I have to make any repairs. The solid black wire is my positive/+ and the black wire with white stripe is my negative/- which matches with most electrical wiring standards.

I have used motorcycle switches to light one or both lights or even multiple lights/usb chargers. You can find 2-3 or 4 way switches fairly inexpensive on Amazon.

It's a SON 28 hub.

I'll check out the switches on Amazon. I don't really want a switch, though. I just want both lights and my Igaro D1 wired in parallel and have the light turned off any time that I'm charging. I don't really need a switch when I can just turn the headlight off.

My tail light Grounds secondarily go thru the Headlight mount.

the Top mount rack lights use the rack, via 1 of the bolts.
the headlight has terminals that deliver the regulated power to the tail light..
What benefit do you think you will gain by bypassing the set of connectors on the headlight?




You going to do an internet search for the Installation manual , next?

I only have one SON hub with connectors, and it didn't come with any instructions at all. I haven't hooked it up yet. Every other brand of dynohub has a negative (ground, return) on the connector, and also the ground is connected to the frame through the axle.

I think the BuM headlights have some taillight protection built in, but you can use them in parallel with a headlight.