Voltmeter Dances while traficator blinks
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5th Gear
Joined: Jun 2007
Posts: 9
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Voltmeter Dances while traficator blinks
I am a happy owner of FLHTC 1990, and since the bike was bought from the 2nd owner it has always been that whenever the left or right turn lights are engaged then voltmeter also flashes. I just got a new original battery from the dealer here in Copenhagen but the problem is still there.
Is that how it should be or what is wrong and how can it be fixed. Any suggestions are heartilly welcomed.
Is that how it should be or what is wrong and how can it be fixed. Any suggestions are heartilly welcomed.
Road Warrior
Joined: Mar 2008
Posts: 1,691
Likes: 3
Sounds like you either have a short or the module that blinks the turn signals is bad. Do you have a service manual for it? There should be connectors for the lights down by the fuse box. Without the service manual you'll have to look at the color of the wires to figure out what is connected to what. If you disconnect the a line and the voltage light stops blinking then you have a short in what you disconnected.
Disconnec the turn signals switchs and you'll stop the problem, but that doesn't help. So don't disconnect all the lights at once so you can be sure the turn signals are still working. If that doesn't stop it then it's likely the module that blinks the lights. It will have running into it the same colored wires as the turn signal switchs and directional lights. The exception is the front ones since they are running lights as well so they have an extra wire that doesn't run to the turn signal module.
Disconnec the turn signals switchs and you'll stop the problem, but that doesn't help. So don't disconnect all the lights at once so you can be sure the turn signals are still working. If that doesn't stop it then it's likely the module that blinks the lights. It will have running into it the same colored wires as the turn signal switchs and directional lights. The exception is the front ones since they are running lights as well so they have an extra wire that doesn't run to the turn signal module.
Thread Starter
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5th Gear
Joined: Jun 2007
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Yes I have a service manual and I have checked the wires connected to the blinklights and seems good. Does it mean I will have to change the blinklight module? When the bike is running the voltmeter reads around 15 to 16V as soon as I start blinking the voltmeter reading starts jumping from around 15V to 12V and when I stop at the traffic lights is between 8V and 12V. Can you help me more about this since my favorit electromechanics here in Copenhagen cannot identify the fault.........
Road Warrior
Joined: Mar 2008
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I can't really say for certain that it's the module. The service manual should have a series of tests to run on the charging system so I would run through those first. Verify the alternator and voltage regulator are functioning correctly.
Before replacing the module I think I would try pulling the bulbs. If you still have the problem then I would disconnct the lamps from the module. If it continues then it absolutely cannot be a short in the wiring. If pulling the bulbs stops it then you don't know, but if it continues despite disconnecting the lamps from the module then it, pretty well, has to be the module.
Before replacing the module I think I would try pulling the bulbs. If you still have the problem then I would disconnct the lamps from the module. If it continues then it absolutely cannot be a short in the wiring. If pulling the bulbs stops it then you don't know, but if it continues despite disconnecting the lamps from the module then it, pretty well, has to be the module.
Road Warrior
Joined: May 2008
Posts: 1,802
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From: Salt Lake City, UT. Dushore, Pa.
My 92 flhtc did the same thing but never had that high 15-16 volt. You probable have a bad voltage regulator and the older wires and bulb sockets seem to cause the fluctuation with the turn signals.
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5th Gear
Joined: Jun 2007
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Hi GMC could you please tell me precisely what you did to solve yours. Right now I will appreciate and try any solutions which can stop this irritation. Thanks in advance
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Road Warrior
Joined: Mar 2008
Posts: 1,691
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Part of the tests for the charging system in the service manual is checking the voltage regulator. You should run through those tests and that will tell you if there is a reasonable basis to believe the voltage regulator or alternator are defective. It will also tell you can do to try to resolve problems with those components without replacing them such as making sure the regulator is well grounded.
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5th Gear
Joined: Jun 2007
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Thanks for all your imputs I have now had a friend come over and have tested the voltage regulator and the stator and seem fine. Because when ignition is on bat. reads 12v and when engine is running reads btn 13.5v and a little over 14.5v.
So now my question is what can I do to permenantly solve this irritating problem???
HELP! HELP! I welcome all suggestions.
Thanks in advance for all of your help...
So now my question is what can I do to permenantly solve this irritating problem???
HELP! HELP! I welcome all suggestions.
Thanks in advance for all of your help...