2016+ Auxiliary Lights Trigger - Yamaha FJR Forum : Yamaha FJR Owners Forums
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  • 1 Post By RaYzerman
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post #1 of 3 (permalink) Old 09-07-2020, 07:14 AM Thread Starter
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2016+ Auxiliary Lights Trigger

Not having found answers to my question (maybe I missed them) on how to trigger aux with high beam headlight, I finally took some time this weekend to figure out.
The solution applies to 2016 and up with LED headlights. Possibly others with LED. Not sure why they chose to trigger with GND (-), but that's how they do on these these.
> In most incandescent cases you would utilize the high beam 12v+ line to trigger the SPDT or SPST relay which in turn activates the aux lights.
> In the case with LED headlights, the H/L - flash handlebar switches or pulses the the NEG (-) side.
> The colors at the handlebar switch are Yellow, Yellow/White tracer and Blue/Black tracer.
> The Yellow/White tracer and Blue/Black tracer are joined in the harness at about where the handlebars meet the triple tree. So basically these two are the same. Go figure why they used two colors. Maybe that's how they where before LED implementation and they reutilized the harness.
> When wiring the relay, you would simply power the 12v+ to your preferred source (leave that part up to you) and then 'trigger' relay using the NEG (-) from the handlebar switch.
> I spliced the harness at that mid point where the harness meets the triple tree. Made the connection there (splice, solder, heat shrink) and resealed the harness. In order to get some slack to work with, you lose the harness wiring clamp under then L handlebar, and remove the L handlebar switch assembly don't the handlebar. This gives enough slack to work the harness.
> In the harness, look for the Yellow/White tracer as that is the joined connection. If you slice the harness enought, about 3~4 in up, you will see where the Blue/Black tracer joins the Yellow/White tracer. This is where I are my connection.
> I closed up the harness and ran the new trigger wire to my relay. That's it. Once done you cannot tell it's there if you are datalird and neat about it. Harness looks OEM and the wire is hidden amongst the other harnesses running from the neck to under the instrument panel.
> I opted to power the aux right from the battery. I also added a switch that allows me to run the aux lights all the time, or switch it to flash or on with H beam.

I did not include pics because when I get into that zone of figuring things out, I just work through it. And suddenly I'm finished and no pics. I will add diagram later so there's a visual which helps some folks.

I'm surprised that I was unabke to find this info anywhere on FJR forums. You'd think that after 4 years with LEDs someone with a service manual would have taken the time to figure this out since there are plenty asking about it. I still don't have a service manual, so this was pure hands on digging research.

Hope this helps.
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post #2 of 3 (permalink) Old 09-07-2020, 08:14 AM
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That handlebar wiring goes forward into the nose with the connectors there. It's a bit more plastic removal but easier to make the connections up there I'd think.
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post #3 of 3 (permalink) Old 09-07-2020, 08:31 AM
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That is good to know. I just put Denalis on my bike and have the “DataDim” relay that allows you to run their lights at 5 watts or 10 watts. They are designed to with use an on/off/on switch, or trigger from the high beam wire. They state in their directions that bikes with LED headlights the high beam circuit has an unstable voltage and will likely cause their lights to flicker.

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