Turn signal does not work and hum - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Electrical
Where does this wire go?
Includes Electrical mods, Lights, Stator,
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post #1 of 11 (permalink) Old 01-15-2016, 01:00 AM Thread Starter
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Turn signal does not work and hum

I have a 89 Vulcan 750. The turn signals or hazards do not work but hum when turned on. I am hoping that somebody on the forum did run across this issue. I replaced the turn signal relay but it is still doing the same thing. Any idea?

Thanks,

Chuck

Last edited by guggech; 01-15-2016 at 01:04 AM.
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post #2 of 11 (permalink) Old 01-15-2016, 06:50 AM
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Where is the hum coming from? Are all the bulbs good? Are they real bulbs or LEDs? The noise must be coming from the relay, but I've never heard of that before. They either click, or do nothing. The Vulcan uses a simple thermal relay. The resistance of the bulbs causes the contacts to open, they immediately cool off and close. This happens over and over again, which is what causes the lights to flash. But the resistance of the bulbs needs to match the flasher for it to work properly. Do the bulbs come on at all?

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post #3 of 11 (permalink) Old 01-15-2016, 10:34 AM
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Check for shorts

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post #4 of 11 (permalink) Old 01-15-2016, 11:30 AM
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Quote:
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Check for shorts
yea, this too. had a weird problem with mine once (cant remember if it was buzzin or what, but it was different), I had a pinched wire under the seat..

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post #5 of 11 (permalink) Old 01-15-2016, 01:15 PM
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Yup that's where mine shorted and it buzzed

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post #6 of 11 (permalink) Old 01-15-2016, 06:09 PM Thread Starter
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The buzz is coming from the relay. The relay has 3 wires so I thing is it an electronic circuit. Now I am thinking that maybe I have and issue with the stator. Looking at the schematic, it looks like one of the connection is going to the stator connector (kind of weird!!). Maybe one side of the buzzer cannot maintain 12 volt and cause the relay to oscillate. I measured the voltage at the relay and when the turn signal is on, the voltage drop to some value like 4-5 volts.
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post #7 of 11 (permalink) Old 01-15-2016, 06:10 PM Thread Starter
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bulb do not come on at all
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post #8 of 11 (permalink) Old 01-15-2016, 07:07 PM
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as previously mentioned, the stock turn signal 'relay' is nothing more than a bi-metal strip, just like they use in cars.

if the 12v side of its dropping to that low of a voltage, you got a short someplace, or a real bad connection on the supply (12v) side of the wiring.

what year? the early vulcans had an auto cancel feature that changes the wiring a bit.. and adds another control module to the works

start with the easiest stuff first.. check all the bulbs... then check wiring to them (look for shorts), then check the wiring from the junction box to the relay, and all the other connections in that area.
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Last edited by michiganteddybear; 01-15-2016 at 07:09 PM.
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post #9 of 11 (permalink) Old 01-16-2016, 09:55 AM
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Quote:
Originally Posted by guggech View Post
The buzz is coming from the relay. The relay has 3 wires so I thing is it an electronic circuit. Now I am thinking that maybe I have and issue with the stator. Looking at the schematic, it looks like one of the connection is going to the stator connector (kind of weird!!). Maybe one side of the buzzer cannot maintain 12 volt and cause the relay to oscillate. I measured the voltage at the relay and when the turn signal is on, the voltage drop to some value like 4-5 volts.
The Tail Light and Headlight circuits are triggered through a relay inside the junction box by the stator. This is so that the lights don't come on until after the engine is started to save power for the starter motor.

Is the bike running when you are doing this test? What is the condition of your battery? Are all your grounds good and tight?
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post #10 of 11 (permalink) Old 01-17-2016, 01:30 PM Thread Starter
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The battery is good as I can start the bike and is about 12.5 volt. I will check for wiring short. Thank you all for your help.
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