HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
crash279

Brake Switch/Electrical Question

7 posts in this topic

I just finished wiring up a hydraulic brake switch on my WR450. Everything is working great except for when I pull the brake lever the rear taillight doesn't illuminate...which kinda defeats the purpose. So here is the rundown: I have one wire, with an inline fuse, connected to one wire of the pressure switch. I have the other wire connected to the yellow wire that goes to the taillight assembly. The taillight bulb stays lit, but like I said, does not get any brighter when I hit the brake.

I broke out the multi meter and I have 12V going to the switch, but at the yellow wire connector I go from 6.8V to 7.9V when the brake lever is pulled. I'm no electrician, but as of right now I'm assuming that I have a bad switch, or is there something else that I need to investigate? Any help is greatly appreciated.

Edited by crash279

Share this post


Link to post
Share on other sites

Mine only works when I press the rear brake, it costs additional money for the front sensor as well

Share this post


Link to post
Share on other sites

Stealth in correct, the addition of a pressure switch is only going to allow the rear brake to activate the brake light. Also, make sure you have a dual filament bulb (tail & brake).

Share this post


Link to post
Share on other sites

I wired a hydraulic switch for the rear brake on ny '04 WR...works great. The link to the wireing diagram is below

You have to wire into the battery as part of the circuit you are creating..otherwise you have an unpowered circuit. Where have you got the wire with the fuse on it connected to?...one end to the switch (as you say)...but what is the other end coming from the fuse connected to. From your description that wire isn't connected to anything.

The diagram below works perfectly on my machine..if you duplicate it using a hydraulic switch from the front brake line, it should work the same way. It doesn't matter if its from the front or the back brake as long as you have a properly installed hydraulic switch...there is no additional "sensor" involved from what I have found.

If you trying to set it up so that you have a rear brake light that works from both the front and the back brakes...then likely you will need a more sophisticated set up..beyond my simple knowledge.

http://s1133.photobucket.com/albums/m595/travertt/?action=view&current=Brakelightwireing_2.jpg

Hope this helps.

Share this post


Link to post
Share on other sites

He just needs the additional sensor if he wants to do that. It was about 10 dollars extra

Share this post


Link to post
Share on other sites

I wired a hydraulic switch for the rear brake on ny '04 WR...works great. The link to the wireing diagram is below

You have to wire into the battery as part of the circuit you are creating..otherwise you have an unpowered circuit. Where have you got the wire with the fuse on it connected to?...one end to the switch (as you say)...but what is the other end coming from the fuse connected to. From your description that wire isn't connected to anything.

The diagram below works perfectly on my machine..if you duplicate it using a hydraulic switch from the front brake line, it should work the same way. It doesn't matter if its from the front or the back brake as long as you have a properly installed hydraulic switch...there is no additional "sensor" involved from what I have found.

If you trying to set it up so that you have a rear brake light that works from both the front and the back brakes...then likely you will need a more sophisticated set up..beyond my simple knowledge.

http://s1133.photobu...htwireing_2.jpg

Hope this helps.

That is exactly how I have mine wired.

Share this post


Link to post
Share on other sites

step A: check the bulb.

step B: check at the connector with a multimeter.. (hold one lead to the wire you just ran, the other lead to something metal on your bike), what you'll see is 0vdc with brake lever untouched, and 12vdc (off battery power) when the brake lever is pulled.. activating the pressure switch. if good, go to step D, if bad go to step C.

step C: next check the pressure switch with a resistance check putting one lead on the battery connector, the other lead on the wire that you're going to connect to the bulb. You should see a "1" reading on the multimeter when you just touch the two leads, then when you pull in the lever, you should see a noticeable drop down to something like "0.07" ish...

step D: if that's good, then check to make sure that the red/yellow are hooked up correctly.

I had the same issue, only I found out after the fact that my "low circuit" was actually hooked up to the bright circuit.. so I switched the two leads and it worked flawlessly..

Edited by rs25

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0