Instructables

Step 1: Get Your Parts

Picture of Get Your Parts
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Get the parts that are needed: 

     Lots of Zip-ties
     Wire
     Copper (I used some 14 gauge Romex I had around my house)
     Tail light (I used a Planet Bike Blinky 3 that I have been using for years on my bike)
     Soldering Iron
     Solder
     Bike

Step 4: Zip-Tie Your Switches to Your Bike

Take your newly soldered switches and zip-tie it to your bike. I have disc brakes on my bike, if you have a different style of breaks I'm sure that a quick re-work will suffice. 

Step 5: Re-wire The Tail Light

Take the battery connector closest to the power button (we are going to be running our wires through here later) and cut it in the middle. This is where we are going to add our wires from our switches. 
ragoldsmith3 months ago

This is awesome and simple, how are there no comments? If you tap your brakes twice and hold, does the light start blinking? :)

cdmselector7 months ago

That is a cool idea. Will do it in few days but wont fixing it at the brake handles be a much more better? I mean, will omit the unnecessary extended wiring. Especially down the fork.

But good job!

Joceyvdv1 year ago
Lol ^^ seriously you should go on shark tank xD improve it though, too look more professional lol Btw, when you said to get the battery connector closest to the switch, will that override the switch? I have one think it's a bell light and it has 4 modes and the 3rd mode is the mode where the light stays, but when I put it on that mode and I test it out by touching the wires it works, but soon after a couple seconds later the light turns off, and idea?
I work at a bike shop, patent that and get it on shark tank. :)
samrianv1 year ago
Clever idea but because there is so much bare wire do you find the batteries bleed out quickly?
tomatoskins (author)  samrianv1 year ago
The only time that current is running though the circuit is when the breaks are applied. There is no reason that the batteries should die quickly at all.
tomatoskins (author) 1 year ago
I didn't know that. I'll have to take a look. Thanks for the heads up!
You can buy v-brake levers (also work with cable pull discs) that have electric switches in them. They are sold for electric bicycles, as cutout switches that activate when braking, but can be wired to engage light systems.
mcraghead1 year ago
Very cool. Absolutely on my to-do list!
madushan921 year ago
great! Thank you. Should try this whenever I am free!
vicesat1 year ago
Very clever, i like it