Need help with flashers and horn

bought my 2002 ktm 400 exc without flashers and horn.

it has a CEV multi switch for flashers, horn and lights.

i bouht the original "euro" wires and hooked up a 1-100W LED relay.

the rear flashers draw 1,4 Watts, the front ones only have 3 LED's each (expect they draw less than 1W).

pulled the indicator light from the wire as well.

my problem is that when i select flasher right, it works great.

when i select flasher left, all 4 flashers flash, the right ones not as much as the left ones.

the horn doesn't work. connect the horn to the ye-s and ye-r wires.

the battery is not fully charged, actually it only has enough juice to turn the starter a couple of times.

i know the flashers draw power from the battery, but will low current have all 4 flashing at once? do i need 4 flashers of same W?

the horn draws 1 amp, but am i wrong if i think it will try to hunk even with 0.5 amp?

frustrating, hope you can help.


The repeater lamp is possibly causing the 4 to flash at once. Try removing the bulb.

Hirn works by grounding the red wire, red/yellow is +12v from the battery. Try grounding the red at the actual horn.

tried removing the indicator bulb, with the bulb in the whole thing just blinks :-( will try the horn, my main suspect that would be the switch :-(

tried removing the indicator bulb, with the bulb in the whole thing just blinks :-( will try the horn, my main suspect that would be the switch :-(

Not sure about your specific model, but on my 09 EXC when I changed to LED turn signals I had to buy a different flasher to make them work. Bought it from SICASS. I don't think they have enough draw to make the regular flasher work. Even with the new flasher, if I unplug my front flashers, the back just flash at the same time like emergency flashers. Might be part of the problem.

thats that i call i flasher relay. i have changed it to a LED 1-100W relay, so it should work.

but you are right, a normal relay wont work like intended with a set of LED indicators.

just saw that the blinker on the right side was constantly on even when the switch is off. defect CEV switch? or something else?

whats your guess?

Constantly on - you have the polarity reversed at the relay. Swap wires, just fixed mine up with one of these and LED flashers:

$9.00 US + shipping ftw!

And yes you must remove the turn signal indicator bulb on 08+ models or all 4 flash. My suspicion is that when you had only 2 on one side and 4 on the other side is a faulty connection. Remove that bulb - swap poles on your relay and wiggle/check the side opposite where 2 only flash.

Good luck!

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

  • Similar Content

    • By Ponch
      I have a 2007 450 EXC that I recently installed a new clutch slave cylinder on. Per the 2007 KTM service manual it clearly states that the clutch needs to be filled with hydraulic oil, which I did (magura blood). That was yesterday. I went out to double check the level today and when I removed the cover, the rubber seal was all contorted and out of shape. I then looked at the cover and it's a Brembo clutch and says "DOT 4 brake fluid only".
      I flushed the line and the master cylinder about 7 times with DOT 4 brake fluid and there was no sign of the magura blood left in the system. My question is: other than the rubber boot on the master cylinder, what damage might have been done by putting in the hydraulic oil? It was in for about 24 hours.
      Thanks in advance for any advice!
    • By pumpernickelBrad
      Hi Folks!

      Sorry if there are a bunch of threads already but I used the site's search function and didn't find anything so far...

      I just found a decent deal on a '14 350 EXC-F with 11k km (unknown hours). Has a few goodies including skid plate, hand guards and it's for sale for about $2k CAD less than a '16 with 6k km on it.
      The bike is in showroom condition (appearance) with no indication it has been offroad at all.

      What would be the gotchas that would make this deal realistic? I'm coming from a WR250R where the engine lasts forever, is 11k street kms high for these bikes? 
      Are there any big defects in the '14s that I haven't dug up yet?
      With no service records what things should be done, checked, etc?
    • By Brannnt
      I purchased an '06 525 EXC some time ago, and recently pulled the motor out of the frame to address some other issues. When I removed the clutch slave cylinder, I noticed an issue the previous owner neglected to tell me about during the purchase.
      It appears that at some point, the chain broke and damaged the engine case near the clutch slave cylinder (see pics, please). I have noticed that the clutch does not fully disengage (bike lurches a bit going into gear, neutral is hard to find... its worse when engine is cold) ... I did not notice any leaks around this area (mineral oil or engine oil) before or during disassembly. 
      The previous owner (or someone) repaired it with some sort of epoxy.
      Without doing my due diligence (checking clutch fluid level, bleeding) I hesitate to state that this is the cause of my clutch disengagement issue ... but pardon my ignorance here and help me out: How bad is this?  Am I looking at replacing my engine case here or is the previous owner's jerry rig good enough?

    • By Black Sox
      Just bought a new 2017 350 excf ,will be doing 98% off road ,ordered skid plate bark busters ,
      my ? Is what's the best easiest way to eliminate rear fender light assembly.I still would like to have a break light.
      xcf fender will fit so dealer says,under $50.00 👍But xcf brake light $125.00 .👎What's the best economical way of doing this?
    • By JNV
      Hi friends from Spain.
      Mi new KTM