Results 1 to 7 of 7

Thread: LED turn signals = rapid flashing

  1. #1
    Registered User PeoriaMac's Avatar
    Join Date
    Aug 2003
    Location
    Washington, Illinois
    Posts
    780

    LED turn signals = rapid flashing

    Having added a Rifle Sportbike fairing to my 1986 R80, I found it necessary to replace the OEM turnsignals and add a couple of Lockheed-Phillips LED flush-mounts to the Rifle.
    With the reduced draw of the LED lights, the turn signal flashes quicker than before.
    Is this anything I ought to be concerned about? My concern is that it might hurt the flasher, and possibly shorten the life of the standard turnsignal bulbs in the rear.

    Conversly, I presumably could add resistors to the hot lines going to the LEDs and bring their draw to the same level as the OEM bulbs.

    Any thoughts?

    Mac
    Mac
    1986 R80RT, 2005 R1200GS
    Livin' Large On The Lake

  2. #2
    neanderssance man sedanman's Avatar
    Join Date
    Jul 2011
    Location
    Pawling NY
    Posts
    626
    Go to a real auto parts store (if there are any left) and get an electronic flasher. These are used for vehicles that tow trailers. The flash rate is constant regardless of load.

    http://www.ezturnsignalkit.com/TurnSignalFlashers.html I have no connection with this company, just trying to help.
    Paul
    "Friends don't let friends ride junk!"
    2011 R1200RT Traded
    2014 R1200RT fully optioned

  3. #3
    Registered User
    Join Date
    Sep 2008
    Location
    Wilmington, NC
    Posts
    2,127
    Flashers are cheap, not an issue.
    But safety matters and probably neither the rear nor front are providing the expected clues about your intent to drivers around you. Hope you still remember hand signals..

    I'd fix the rate with a different flasher or resistor if I had to keep the fixtures you added but by preference I would have looked for a compatible part at the outset (either std bulb or led) to avoid this predicatable problem. It will happen with any LED not designed as direct bulb replacement on a machine originally equipped with bulbs.

  4. #4
    Registered User kioolt's Avatar
    Join Date
    Apr 2003
    Location
    Maryland
    Posts
    390
    If you go the resistor route than the resistor goes from the hotline to ground, not in series with the hot line.
    2004 R1150RT 151,500 miles , 1991 K100LT 128,000 miles, 1982 R100RT 106,900 miles
    Total 386,400 BMW miles
    AMA,BMWRA,BMWMOA
    The cheapest thing on a BMW is the nut that connects the handlebars to the seat.

  5. #5
    neanderssance man sedanman's Avatar
    Join Date
    Jul 2011
    Location
    Pawling NY
    Posts
    626
    Quote Originally Posted by kioolt View Post
    If you go the resistor route than the resistor goes from the hotline to ground, not in series with the hot line.
    I had to think about that one for a minute but it makes perfect sense because if it were in series it would not affect curent flow. In series the total circuit resistance is equal to the value of the smallest resitor in this case the LED. I remember an electrical instructor saying "A resistor is only a resistor when it is under load"
    Paul
    "Friends don't let friends ride junk!"
    2011 R1200RT Traded
    2014 R1200RT fully optioned

  6. #6
    Registered User kioolt's Avatar
    Join Date
    Apr 2003
    Location
    Maryland
    Posts
    390
    Quote Originally Posted by sedanman View Post
    I had to think about that one for a minute but it makes perfect sense because if it were in series it would not affect curent flow. In series the total circuit resistance is equal to the value of the smallest resitor in this case the LED. I remember an electrical instructor saying "A resistor is only a resistor when it is under load"
    Actually you're wrong on both. In series it would affect the current flow because the toal resistance is equal to the sum of the resistor and the LED. Current flow would go down due to higher total resistance.
    2004 R1150RT 151,500 miles , 1991 K100LT 128,000 miles, 1982 R100RT 106,900 miles
    Total 386,400 BMW miles
    AMA,BMWRA,BMWMOA
    The cheapest thing on a BMW is the nut that connects the handlebars to the seat.

  7. #7
    neanderssance man sedanman's Avatar
    Join Date
    Jul 2011
    Location
    Pawling NY
    Posts
    626
    I stand corrected.
    Paul
    "Friends don't let friends ride junk!"
    2011 R1200RT Traded
    2014 R1200RT fully optioned

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •