New Problem - My left turn signal only works intermittently. - Page 2 - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #11 of 21 (permalink) Old 08-29-2019, 09:03 AM Thread Starter
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Looking at the wiring diagram it looks like the hazard switch feeds power separately into the signals from the switch on the left hand side. So maybe that wire that I've boxed in in bright magenta is where the problem is

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post #12 of 21 (permalink) Old 08-29-2019, 10:56 AM
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I would try to manually connect the two wires you have indicated at the handlebar end. If that works every time, it must be the switch itself...otherwise it's likely one of the wires...
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post #13 of 21 (permalink) Old 08-29-2019, 02:15 PM
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I have had this problem with a car back in time. Nothing was found faulty, no switches, not flasher unit, not wiring to and from. Replacement bulbs cured the problem, don't know why.
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post #14 of 21 (permalink) Old 08-29-2019, 03:50 PM
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From your box go down... magenta and green (and I think yellow) go to the signal lamps themselves. Bulb contacts can have oxidation, etc.

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post #15 of 21 (permalink) Old 08-29-2019, 05:29 PM
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I have had this problem with a car back in time. Nothing was found faulty, no switches, not flasher unit, not wiring to and from. Replacement bulbs cured the problem, don't know why.
Duck!! I said the same thing earlier but got poo-pooed and politely dismissed.

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post #16 of 21 (permalink) Old 08-30-2019, 04:49 PM
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Duck!! I said the same thing earlier but got poo-pooed and politely dismissed.
It was a car less than a year old, I went to the dealer service desk and had a moan about it, they said they could look at it in 3 weeks time.
One of the mechanics was passing through behind the desk, heard me and said put some new bulbs in it, but not the cheap bulbs like the factory fits!
That sorted it!
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post #17 of 21 (permalink) Old 08-30-2019, 07:21 PM Thread Starter
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I didn't dismiss it so much as I really don't want to take the fairings off again quite yet so I'm coming up with excuses.

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post #18 of 21 (permalink) Old 08-31-2019, 12:01 AM
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I would try to manually connect the two wires you have indicated at the handlebar end. If that works every time, it must be the switch itself...otherwise it's likely one of the wires...

If jumpering the switch works, yep, it is probably the switch. If no joy, look at the left circuit. You know the the other two wires work because the right side bulbs work.


Ray, if I correctly read what Aran wrote, failure mode is both the front and rear turn signals. Unlikely that both left bulb holders are bad.


Aran, the thing to keep in mind about electrical diagrams is that even if they accurately show current flow, they may not accurately depict actual physical layout. Look at the brown wire. It shows a series of junctions. Is it? Or is there just a single multi-wire junction. The diagram may not tell you.

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post #19 of 21 (permalink) Old 08-31-2019, 08:32 AM
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I didn't think rears... not clear... I made an assumption front because the connectors up there can get corroded/not waterproof... Aran, might be able to just remove the fairing inner panels without taking the sides off....

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post #20 of 21 (permalink) Old 08-31-2019, 06:15 PM Thread Starter
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Yeah it's both the front and rear that stop working at the same time. I haven't had a chance to look at it again and won't until after work tomorrow, but it's been intermittently working the last couple days enough that I'm willing to bet it's just a loose wire somewhere the way it comes and goes.

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