The Airheads Beemer Club is a non-profit club reclaiming the 'Legendary Motorcycles of Germany'

Topic-icon Odd issue with X-arc Duos

  • Hoobie7
  • Hoobie7's Avatar Topic Author
  • Offline
  • R100 Level
  • R100 Level
More
2 months 1 week ago #4758 by Hoobie7
Odd issue with X-arc Duos was created by Hoobie7
I purchased a set of X-Arc Duos from High Tech Speed . I got them wired up and they work great when the engine is off: running, brake and signal lights. However when the engine is running the yellow LEDs flicker like crazy. I have moved the spark plug wires away thinking it was EMI. I have unplugged the flasher relay and the voltage regulator completely and yet it continues. I have LED signals on the front that do not do it and I have plugged other LED signals to the rear and they don't do it. I'm worried it has something to do with the smarts built into the X-Arcs. I have a basic electronics background but this one has me completely baffled. Any help would be appreciated!
Quick demo here.

Full demo here.

And full album here.

Thanks!
Hoobie7

Please Log in to join the conversation.

More
2 months 5 days ago #4792 by murphyam53
Replied by murphyam53 on topic Odd issue with X-arc Duos
Hoobie7,
I've been thinking about your problem for about a week, and I have some ideas. Let's find the solution.
The specs on your lights are 11 to 16 volts operating range with less than 1 amp current consumption. The flickering must be caused by low voltage. The front lights don't flicker with the engine running, so no low voltage problem at that end of the bike. The wiring difference between the front of the bike and the back is the ground location. The schematic I have for your bike is from the Clymer manual, and it shows the front lights ground near the lights, probably in the headlight bucket (though the schematic does not show a ground wire from the bucket to the frame). The rear lights ground at the main ground point somewhere on the frame. On you bike, it appears to be on the left side of the top frame tube at the coil mount, that group of brown wires. Clean this ground lug and the coil bracket thoroughly. If the ground lug crimp looks badly corroded, cut it off, restrip the ground wires and crimp on a new lug. I would recommend adding another ground wire from this ground point directly to the negative terminal on the battery. Now try the lights with the engine running.
As an additional suggestion, get rid of all those 'scotch lock' splices. Those are the blue in-line splices I see in the headlight bucket and the taillight housing. They will always develop corrosion problems and cause unreliable connections with time and exposure to the elements. Solder or crimp butt splices with heat shrink or liquid electrical tape as necessary is always a better, longer life solution.
Let me know how this goes. We can fix this.

Andy
ABC #15601

Please Log in to join the conversation.

More
2 months 5 days ago #4793 by Wobbly
Replied by Wobbly on topic Odd issue with X-arc Duos

murphyam53 wrote: As an additional suggestion, get rid of all those 'scotch lock' splices. Those are the blue in-line splices I see in the headlight bucket and the taillight housing. They will always develop corrosion problems and cause unreliable connections with time and exposure to the elements. Solder or crimp butt splices with heat shrink


+1 on the in-line splices.... Additionally, get rid of the wire nuts seen in the tail lamp housing.

You want to use the same high quality level of wiring termination as seen under the hood of a new car. Everything else goes intermittent in 6 months on a motorcycle, where it's exposed to mud, wind-driven water, ice, hot oil, fuels, etc. It's an extremely rough environment.

Don't hide 'em, Ride 'em !!
#15150

Please Log in to join the conversation.

More
2 months 3 days ago #4804 by Wobbly
Replied by Wobbly on topic Odd issue with X-arc Duos
Also looked through your photo album. Very interesting.

The "Max Protection/ Max Power" spark plug cables you have shown on your bike may be the incorrect cables. The only cables I could find listed on their web site are "suppression" type spark plug wires for cars, and those are not correct. You should be using metallic core wires with 5,000 Ω plug caps.

Don't hide 'em, Ride 'em !!
#15150

Please Log in to join the conversation.

  • Hoobie7
  • Hoobie7's Avatar Topic Author
  • Offline
  • R100 Level
  • R100 Level
More
2 months 3 days ago #4805 by Hoobie7
Replied by Hoobie7 on topic Odd issue with X-arc Duos
That's funny as I've spent the last week or two ignoring the problem out of frustration. ;) However your posts have inspired me and I am back on the case. As for the vampire splices(scotch lock), those were one of the first things I got rid of after I bought the bike, I hate those things. As for the wire nuts, those are gone too. All of the taillight stuff got cut off and I got myself a Weather Pack kit and terminated it properly. There are pics of that effort in the album that are hopefully visible.

A bit of history on the bike and myself. This is my first motorcycle and I bought the bike off Craiglist in a non-running state from a guy two hours away. Probably not the best idea for a first bike but it's what I wanted. The guy I bought it from only had it a few months and had a couple other bikes in the garage so I think he was done trying to make it work. I think the owner before him had put on a full fairing and hard bags of some type, that would explain all the wire splicing. To get it running last year I mostly just had to plug wires in to their proper places. The key tumbler was wired wrong so it wouldn't turn on, the coils were wired wrong so it was running on one cylinder. I found several of the color coded wires were simply plugged into the wrong color on the board . Once I got that all sorted the bike ran pretty well and I rode it all last summer. It was not without it's issues though. It had a headlight relay go bad , it left me stranded once when it died and would not restart, it was blowing fuses when I used the turn signal due to a frayed wire . Needless to say I have worked through some electrical issues with it.

Please Log in to join the conversation.

  • Hoobie7
  • Hoobie7's Avatar Topic Author
  • Offline
  • R100 Level
  • R100 Level
More
2 months 3 days ago #4806 by Hoobie7
Replied by Hoobie7 on topic Odd issue with X-arc Duos
As for this issue I've tried may things:
- I thought it might be EMI so I wrapped the plug wires in tin foil
- I replaced the turn signal relay since I have LEDs so I unplugged it entirely to isolate the issue
- Since they seem to flicker with the engine PRM I unplugged the voltage regulator to try and isolate the alternator
- I unplugged my battery tender thinking it might be causing an issue
- I plugged in other LED lights to see if they did the same thing, they don't
- I thought it may be a short in the rear light wire loom so I ran jumper wires all the way to the back

So for my next steps I think I will fix that ground bundle as it is frayed almost all the way through one wire. Then..... I don't know.

Please Log in to join the conversation.

Moderators: Wobbly
Time to create page: 1.303 seconds