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Thread: 12 V Signal Source

  1. #1
    143439 bobr9's Avatar
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    12 V Signal Source

    1999 R1100RT

    Looking for a 12V switched signal source for auxiliary fuse panel. I am looking at using the brown/blue middle lead into what I think is the diagnostic plug which sits just aft of the fuse box. It has three leads into it. The middle lead looks to provide a good signal with the ignition on.

    Have others found this to be a good source signal for relay activation? Any downsides? Should I be looking elsewhere? Thanks...Bob

  2. #2
    Cannonball Rider #52 darrylri's Avatar
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    Typically people tap into the parking light in the headlight. It's pretty easy to get to, and it doesn't carry a digital signal on it that could be messed up with a possibly noisy relay. Another location to look at is the accessory socket.
    --Darryl Richman, forum liaison
    http://darryl.crafty-fox.com

  3. #3
    143439 bobr9's Avatar
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    Quote Originally Posted by darrylri View Post
    Typically people tap into the parking light in the headlight. It's pretty easy to get to, and it doesn't carry a digital signal on it that could be messed up with a possibly noisy relay. Another location to look at is the accessory socket.
    Ok, thanks. By accessory socket are you referring to the accessory plug on the left side of the dash or another plug?

  4. #4
    Cannonball Rider #52 darrylri's Avatar
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    On my R1100RS, the socket is down on the starter motor cover on the left side. It's the cigarette lighter-like socket that you could plug your heated vest into, for example.
    --Darryl Richman, forum liaison
    http://darryl.crafty-fox.com

  5. #5
    Day Dreaming ... happy wanderer's Avatar
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    Best to check that accessory plug connector with a meter first. On my 1100RT it is un-switched i.e. hot all the time.
    I recall reading here a lot of folks use the tail light power wire for switched power to a Centech unit relay.
    Great schematics here: http://www.mac-pac.org/wp-content/up...Diagram-V2.pdf
    MJM - BeeCeeBeemers Motorcycle Club Vancouver B.C.
    '81 R80G/S, '82 R100RS, '00 R1100RT

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