Is there a headlight/taillight system that can be turned on with one switch, rather than turning on 2-4 lights each individually?

  • I guess you mean battery driven (each) rather than dynamo powered? In the past I used to switch on the dynamo to get all lights on in one go.
    – Willeke
    Commented Aug 20, 2017 at 17:32
  • 2-4 switches is too many? Last night I turned on 6 rears, 3 fronts, and a camera.
    – Criggie
    Commented Aug 21, 2017 at 5:22

2 Answers 2


It's an easy modification to make if they use the same voltage and have simple on/off switches. I've done it on an e-bike. But I'd only make the primary tail light share a switch with the headlight. Without a backup you've introduced a single point of failure which is a bad thing even if your wiring is rock solid. A single wire heading to (multiple) rear lights could break and you wouldn't even know you were showing no light from behind.

You could look into motion sensing lights for the back (they may also exist for low power front lights), especially as your secondary lights so you only have to switch two lights on. Some of the solar rear lights have this feature.

  • Of course, if the voltage is different it's still not hard, just probably a little beyond the scope of an answer here
    – Chris H
    Commented Aug 20, 2017 at 20:24

The ANT+ lights standard allows for "0" switches to turn on/off bike lights. (Besides the initial power on of the head unit)

I run a bontrager flare rt with my edge 820 and it works great.

Completely wireless, it automatically adjusts brightness, and even has a "brake light mode".

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.