Lights not working? Check your relay. 2019 KTM 500 EXC-F

The lights went out but the bike still ran. Electrical issues can be incredibly difficult to troubleshoot; thankfully mine was easily fixed.
My bike is a 2019 model. Relay location has thankfully changed in '20+ models, now under the seat instead of inside the airbox.
Taco Moto Co video on how to check relays • 20+ KTM TESTING FUEL P...
*Big shout-out to Richard from Vortex who helped me narrow down this issue!
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[@bikeaction.]

Buy yourself a tube of "Dielectric" grease and use a little on all of the spade lug connections. Cheap insurance and will reduce issues with electrolysis and related issues. Interested to know if you compared the current draw of your new headlight in relationship to the original. Glad you solved the issue mate👍.

[@C_R_O_M________]

Great advice but we all know how boring of an ordeal is to actually apply that.

[@ianhughes2525]

great video, I cant find my relay on the internet only from ktm, plenty of very similar ones but none with m37 in the number. mine is acm33221 m37 lots around but have m37, do you know what m37 refers too, and what other one can I use. my lights dont work many Thanks

[@maximusmurua4437]

Thank you very much; I really appreciate you sharing

[@JasonsCrypticchannel]

great video Keith!! i have a 2020, and the relay's are on top, and mine are on an downward angle so water wont stay in the connectors...

[@muddysidedown]

Same location here. I'm using an electrical cleaning solution and then applying fresh electrical lubricant inside all the relays. Inspecting zip ties and rubbing areas on all looms. I'm glad this is only a bike, phew!

[@maccas44]

Good on ya Keith thanks for posting

[@Zobby447]

Those relays are also sensitive to cteck chargers. The pulse would also send current into the fuel pump and prime when parked.

[@bluebaaron748]

my 23 500 turn signals stopped working after I used a similar charger. Fuel pump would prime when charger was attached. Relays got noticeably warm too. I have been checking every connection and can't find any other issues, other lights work fine. Seems I need to try a new relay...

[@malsadventuresoz]

Exactly what happened to my 2018 300 TPI 6 months ago. I wish I found this video earlier. Thanks for sharing, and hopefully others find this before pulling everything apart. Cheers.

[@keithjob]

Glad it helped

[@danielpolanske]

@@keithjob hey Keith I have a 2012 ktm 500 exc f I went for a ride yesterday and upon leaving my lights where working fine. On my way home it was dark and all light where working, i was 20 minutes from home and noticed my head light / park light stopped working? My indicators still work my horn works and my brake light lights up when I brake but apart from that I have no lights at all. So far I checked all fuses under the seat and none where blown it was quite dark so haven’t checked all wiring but for a 2012 model the bike is in excellent condition wiring and lights are all stock any suggestions what it could be Keith??

[@MarcAlvinCorpuz]

Thank you Sir.. Watching from the Philippines!

[@timbotimbo_Crypto]

Any other suggestions if the fuse and relay is good. My relay is working but still no lights

[@1stDirtDevil]

Anyone got a video on how to replace the part the relay plugs into?

[@ThisTall]

Are you sure your bike is a 2019? Because my 2018 has the relays located just like yours, but I’ve seen multiple 2019s that had them on top by the battery.

[@keithjob]

MY19, yes. But built in 18.

[@distilledfreedom1840]

2015 FE 501. Headlight suddenly doesn't work. All other lights, horn, engine unaffected. Think it's the same relay? I can't find it.

[@keithjob]

Might not be that relay, if the other lights are working. Could be something simple, like the headlight fuse, or globe.

[@MotoWorld777]

yea, all the connections get dirty and corroded over time. I had my started fail, as in it would not work, as I checked the bike over I found the ground near the battery had corroded, the aluminum sub frame connection.

[@algee8228]

Its a good idea to run an additional ground wire from the (-) on the battery up to the ground point at the front of the frame. This provides a parallel ground path to that troublesome sub-frame connection.

[@simonbarton908]

Legend! Thanks mate this vid saved the day!

[@ivanjarlov1798]

Thanks mate

[@ogasi1798]

all my lights work aside the bloody rear running light, brakes fine, headlight fine, PITA happened at random, i cannot see it being a relay at this point which leaves one option - cannot believe i have to replace the rear light system but it seems to be the only way, any ideas before i buy at 75 GBP?

[@algee8228]

You need to troubleshoot your way through the wiring & connections to the rear. KTM owners need to be good at this...ask me how know! Getting the wiring diagram sure helps.

[@TacomaImports]

You ever figure out what the issue was?? My rear running light still not working. Chased everything. Driving me nuts.

[@ogasi1798]

@@TacomaImports no mate, I've resorted to carrying a light I attach to my bag at night 😂 brake light is fine, volts once brake is pressed are about 14 and when not pressed it's about 12 so I think something in the running light led circuit isn't correct I've decided as it is winter soon that I am buying a new light for 2 pound from Ali express to see if it works, if so I may get the oem version but I'm not buying the ktm light for 85 pounds just to find out it wasn't the unit

[@renatusvonstahlburg3918]

What is ACU. i an german dont understand this

[@keithjob]

ECU. Electronic Control Unit. The computer that runs the bike

[@renatusvonstahlburg3918]

@@keithjob in german we say: Steuergerät ;-)

[@clemens9443]

​@@renatusvonstahlburg3918😂👌🏽

[@clemens9443]

​@@renatusvonstahlburg3918Hast/hattest du auch Probleme mit dem Licht? Grüße aus Österreich

[@renatusvonstahlburg3918]

@@clemens9443 ja springt an, aber kein licht, blinker kein bremslicht alles tot, sicherungen ok, vermute ein relais oder kabelbruch

[@simonhantler8062]

keith nothing too with relay. what sprocket sizes do you run.

[@keithjob]

Currently 14/48

[@simonhantler8062]

@@keithjob ive just ridden my 500 for the first rime since new. ive got 13/50 on and its revving hard at 100kmh. i dont do a lot of road riding on it and found first gear way to low on dirt so could go to 14/48 easy. any idea what yours is revving at 100 kmh?

[@keithjob]

no idea. (why don't KTM give us a rev gauge???????)

[@simonhantler8062]

@@keithjob my gearing is 13/50 and the sweet spot is 80 kmh. more and it’s reving a bit to high. i’ve only just started to ride it, love it so far. wouldn’t want to ride too far on seal.

[@Zobby447]

Hey keith great video as always. I’ve also had this issue with the fuel pump priming itself and the the dash would light up when parked in the shed was the same rely they get full of crud