12 V Signal Source

bobr9 · May 10, 2013

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

darrylri · May 10, 2013

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.

bobr9 · May 10, 2013

darrylri said:
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?

darrylri · May 10, 2013

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.

happy wanderer · May 11, 2013

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/uploads/2013/02/R1100RT-Elec-Diagram-V2.pdf

12 V Signal Source

bobr9

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darrylri

Cannonball Rider #52

bobr9

143439

darrylri

Cannonball Rider #52

happy wanderer

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