Harley-Davidson CAN Bus wire Tech Tips

[@kmeades43]

Always learn something with your videos Doc 👍. Ride safe from Sydney Australia ✌️✌️

[@LowCountryHarleyDavidson]

Thanks to you all down under….Doc

[@williwichtig9344]

Hi Doc, every time a pleasure to collect information given by you. Greetings from overseas Uncle Harry, Germany ✌️

[@LowCountryHarleyDavidson]

Thank you….Doc

[@bobuhlman9965]

Glad you're back at the informative videos, Doc. :)

[@larryc276]

Excellent advice Doc

[@VikingOnTrail]

I have now been thoroughly enlightened....THX Doc Harley

[@doylehenderson319]

I'm surprised that HD didn't use a shielded cable to reduce the chance of EMF to be induced into a low voltage cables. Thanks Doc for the heads up!!!!!

[@allborosnyc4544]

It's a great idea but i'm not surprised because HD wants you to bring the bike to the dealer for repairs.

[@freddie_ray1498]

@@allborosnyc4544 Amen to that. HD is worse than a drug dealer. They get you on the come back...

[@schachat01]

Thanks Doc for another great tech tip-enjoy all digital insights relating to; canbus, J1852, ECM, BCM, EFI tuning etc👍🏻

[@daviddunn5264]

👍🏻👍🏻👍🏻 always appreciated, thanks Doc

[@LowCountryHarleyDavidson]

Thanks David….Doc

[@tomb.8485]

Great tips,

[@rykerolaoghaire8781]

Awesome information, Doc! 🙏

[@RedDevilinCali]

Doc, this is the best HD resource media that is on the internet. Your show and information is the best. I just bought the 2023 CVO Road Glide and noticed that it makes a faint humming/clicking noise when it is off. I narrowed it down to a relay switch (REF: 71400100 ("Relay ,SPDT, Sealed, Micro W/RES SUPP)) located under the seat and under the braking control system. It rides great and am having no issues, but the sound is concerning. I believe that it shouldn't be making this sound. I informed my HD service shop and they said they didn't know why it was making that sound. I've owned HD bikes and never heard any noises before. Is this normal on this bike, or I am correct to be concerned with the relay making this noise while turned off. thank you. Keep up the great work. You should have your own television show.

[@LowCountryHarleyDavidson]

Thanks for watching and posting. I am curious. Your year and model has a Body Control Module instead of relays. So what is making the noise? Your bike probably has security. Does the noise come on the same time the security flashes the turn signals? Does your security also have the optional siren? Just wondering if the noise has to do with the bike powering down…Doc

[@RedDevilinCali]

thanks for your help. The 2023 CVO RG does have a security system and siren. I only hear the noise when its off, its very faint but i can hear it when i am standing near the bike. I can hear it when I walk into my garage. LOL It sounds similar to a fish tank air bubble motor, but faint and constant, it never stops. I looked at the HD website and looked at the part diagrams, thats where i got the part information from, they look like relays. Thanks for responding. @@LowCountryHarleyDavidson

[@garyzanghi9272]

Great video Doc A+

[@fourftr]

Doc Would you do a video on the M8 comparing the liquid cooled versus the oil cooled and use a day that temperatures are in the 90 plus degrees riding in stop and go traffic. I understand the liquid cool just cools the exhaust part of the heads and not the oil. IMO then oil cooled would be better option because you can add those fans on the side

[@lynnsample4549]

Offset solder joints are easier to get through small openings also. (Not that you would want to put small wires through small ports!) 😊

[@stevezahn8056]

Well doc everything you just taught me has nothing to do with my old 98 Evo. But it was really interesting. I’ve never considered not soldering wires side by side.

[@LowCountryHarleyDavidson]

Thanks for watching….Doc

[@freddie_ray1498]

Doc, thanks for the information...My ride is a 2012 FLHTK, but it does help to be knowledgable should I find a CAN BUS bike broken on the side of the road...

[@TechNWRO]

Hey Doc, Here is one that is driving me nuts. LED turn signals on a 2023 FXLRST that are working properly. However, the dash is flashing at hyper speed. Tried a few learning techniques that involve the 4 way flashers with no luck. PS Thank you for the videos!

[@LowCountryHarleyDavidson]

What you see will not hurt your bike. It has to do with the LED you chose. The Amazon lights can not be programmed right. Some Dynamic lights can be told to work right by the dealer computer. The expensive HD LED would be working right😄. The BCM only likes a certain resistance. Your of course is not🤷‍♂️…Doc

[@SamSwanner]

Not going to lie, I want to hear about the '79 XLH in the background

[@Tobba102]

Seriously love your videos. Presentation and content are awesome! Please get yourself a better mic.

[@LowCountryHarleyDavidson]

Are air conditioner is dying so a lot of noise around so mic too close. Low budget production….Doc

[@mynameisearl1777]

Good Information. Thx

[@Dinoxt12]

Yessar...extra special tip...thanks.

[@mattclose4202]

Awesome video as usual 👍 I had a question about my 2018 Harley ultra Limited. I have two bigger imported maps in my navigation and they won’t load and keeps crashing my system. I’ve been trying to delete them off there but can’t open them up to delete them. Is there another way you can remove them?

[@LowCountryHarleyDavidson]

Please take it to dealer to have software put back to Pre-calibration Factory reset. When was the last time you updated the Nav Software?…..Doc

[@mattclose4202]

@@LowCountryHarleyDavidson I’ve updated the software that you find on Harley’s website. Is what your talking about different than that?

[@joebouchard3585]

Hey, Doc - do you ever do any videos on cleaning your motorcycle? I just bought a 2018 Fat Boy and I am confused about how to clean and protect the aluminum wheels…

[@LowCountryHarleyDavidson]

I did a while back. An interview with our detailing pro….Doc

[@carlomonaco2130]

Hello Doc Harley, just a question from one tech to another. According to the Motor Company, when dealing with the can/bus system, that you shouldn't cut and solder the wires at all due to the fact of how sensitive the BCM is to voltage fluctuations and by soldering you are introducing that into it. Also would like to know your procedure for replacing a faulty front brake light switch on a BCM bike, do you replace the entire control module? or do you cut and solder in the replacement switch? thank you.

[@LowCountryHarleyDavidson]

You are correct to a point. BCM is sensitive but a broken wire can be repaired. Of course the Factory encourages replacement.The new controls are an assembly and can not be repaired as the separate switch functions of the past…..Doc

[@Chrisbea3981]

Sorry not sure the best place to ask this but does the new 135 crate engine come with a better compensator

[@LowCountryHarleyDavidson]

No….Doc

[@1Bigduff]

Would putting a choke (Ferris clamp) on either the CAN bus wires or the stereo wiring help the RF interference? I know I had trouble with a LED headlight interfering with my radio on a 2012 ultra classic and it seemed to help. just curious. another great video. Thanks, Duffy.

[@LowCountryHarleyDavidson]

I do not have experience with that but always open to new ideas👍….Doc

[@mynameisearl1777]

would electrical tape and/or shrink tube be enough insulation to prevent influence?

[@Loose_Lucy]

Any update for the video you did on the discontinued turn signal module on the older bikes ?

[@ardyrides834]

I bought a TSM for my 2000 FXDWG directly from the H-D online store. They were on backorder. I had to wait about 6 weeks.

[@LowCountryHarleyDavidson]

No update yet. ….Doc

[@cameronbartley6139]

Got a question Doc. Can I connect the wires directly to the battery to power un extra set of LED Fog lights.

[@cameronbartley6139]

The leds are going on a 2015 Street Glide

[@LowCountryHarleyDavidson]

Yes but must have a dedicated fuse in the power wire….Doc

[@cameronbartley6139]

@@LowCountryHarleyDavidson thank you much appreciated

[@rodvan-zeller6360]

Does that system use 2 120 ohm termination resistors?

[@kennethanderson1685]

❤

[@shawnkeene3370]

Which one is the can H and the can L?

[@LowCountryHarleyDavidson]

This has created a fun time in the shop. Asked every tech. The answer 🤷‍♂️. We have always followed the DTC with Flow chart…..Doc

[@fredmancina4551]

Quick question. (2016 Road Glide Special) Had the bike on tender. Turn bike on & move it, a few mins. later started the bike up. VINERR code popped up. Never had problems with codes etc; Changed the battery. Codes still appear.. Didn't clear the codes. However the bike starts up & runs good, no issues. Only thing is the speedo & tact. jump around, battery light goes red (shows no voltage) radio cuts in & out. Any solutions??

[@LowCountryHarleyDavidson]

That’s no quick answer. You have a connection loose or a ground wire broken….Doc

[@All_Knight]

Hey what’s up Doc. I’m hoping I can speak with you in reference to a situation I’m having. Let me know if that’s possible… TIA

[@LowCountryHarleyDavidson]

Best to Email all your information so I can research and possibly give the best suggestions….Doc

[@garyzanghi9272]

Huge impedance bump in that solder joint for a digital signal, also use rosin core and NOT acid core

[@LowCountryHarleyDavidson]

I was told silver solder is best….Doc

[@garyzanghi9272]

@@LowCountryHarleyDavidson to much heat

[@paintballsteve55]

Doc, can you make a video on how to properly check the M8s oil? Seems like there’s a lot of misinformation on forums, etc.

[@LowCountryHarleyDavidson]

What does your Owners Manual say? Give me some examples of what the Forums are saying. Send it to my Email address….Doc

[@DNiddy]

Bazinga.

[@roncoburn7771]

good one doc wires scare me i will stick with building motors

[@joeharley87]

Glad I still have a couple of old Evos. LOL

[@shameless6963]

I'll stick with my shovelhead and not worry about high tech stuff like that

[@dawnmathis2659]

I’m going to stick with my carrer pigeons. No high tech phone for me.

[@labeanlabean]

This is not good. Have such wires unshielded. Sometimes we used aluminum foil tape to shield the signal wires.

[@LowCountryHarleyDavidson]

I covered a helmet with tin foil as a child so aliens could not read my mind….Doc

[@PanM8]

​@@LowCountryHarleyDavidson🤣🤣👍👍👍👍👍👍👍👍👍

[@labeanlabean]

😁@@LowCountryHarleyDavidson

[@blairwhitaker3078]

"Promosm"

[@LowCountryHarleyDavidson]

🤷‍♂️….Doc

[@tamayo991]

Can Bus is nothing more than a local network on a harley. Any IT guy would understand.

[@NickAlati]

Down the road if they haven't already done so. They will use shielded wire to prelectro a magnetic flux from influencing the data flow.