The ultimate.... - BMW Luxury Touring Community
 
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post #1 of 9 Old Jun 30th, 2010, 3:21 am Thread Starter
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The ultimate....

stupid question... WTF am I doing wrong? I have a 2710 and a radar detector that I am attempting to wire into the GPS lead on the BC3. Of coarse I get a whine which is why I got ahold of a radio shack audio isolator. (273-1380).

From the BC3 I am just using the white audio and ground, I know the 2710 is throwing a mono signal as well so the issue must be with how I am wiring the transformer.
White and red on the 8ohm side and blue, black, green on the other..

What goes where gentlemen??? is it me or is the search function a little flawed lately?

Hoss
'Stupidity has a knack of getting its way.' --Albert Camus
'05- K1200LT - Gretchen
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post #2 of 9 Old Jun 30th, 2010, 1:27 pm
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Re: The ultimate....

I found this in my notes when I was putting a garmin Ique into the BMW comm system. It was written by Mark and I think it may be what you need.

ComSystem-equipped bikes

Colors are orange, blue and white.

Orange: +12V
White: +Audio
Blue: Ground

A search will reveal wiring instructions, such as: Don't hook up the GPS's speaker ground wire to the ComSystem harness ground -- avoids heavy audio feedback).

Mark Neblett
Fairfax, VA

Hope it helps,

Ron


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post #3 of 9 Old Jun 30th, 2010, 3:58 pm
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Re: The ultimate....

I am somewhat confused here and need a little remedial ET training.

How are you going to get a transformer to work without both leads on each of the "Primary and Secondary" sides of the transformer connected?

Just asking and since its been a long time since Kurchafs Laws I will listen intently. Heck I barely remember Ohms law LOL

Also the colors listed below dont match the Garmin 2720 so there might be some confusion with it.

Later Steve A

Quote:
Originally Posted by kellenbenz
I found this in my notes when I was putting a garmin Ique into the BMW comm system. It was written by Mark and I think it may be what you need.

ComSystem-equipped bikes

Colors are orange, blue and white.

Orange: +12V
White: +Audio
Blue: Ground

A search will reveal wiring instructions, such as: Don't hook up the GPS's speaker ground wire to the ComSystem harness ground -- avoids heavy audio feedback).

Mark Neblett
Fairfax, VA

Hope it helps,

Ron
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post #4 of 9 Old Jun 30th, 2010, 5:31 pm Thread Starter
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Re: The ultimate....

Quote:
Originally Posted by kellenbenz
Colors are orange, blue and white.

Orange: +12V
White: +Audio
Blue: Ground

Thanks Mark, I actually saw your response right after I buttoned everything up. Sooo... like a giddy school girl, I went back out to the garage took the hood off and soldered away.... F&^K, no joy! no worries though, it may be my patch cable I made to avoid the 3.5 pigtail hanging from the dash.. When I get the gumption I will try it again with the OEM connections...

As for the Comsystem colors noted above....Spot on, them be it!

Hoss
'Stupidity has a knack of getting its way.' --Albert Camus
'05- K1200LT - Gretchen
R.I.P. - '00- K1200LTE- "Barbara" - Retired at 168K 9/2011
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post #5 of 9 Old Jun 30th, 2010, 7:18 pm
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Re: The ultimate....

Wrong part Hoss, you need the #273-1374, 1:1 isolation transformer. Audio device connects across one side the intercom input goes to the other side. It is listed for phone lines but will work just fine in this application.


The one you listed matches a high impeadance to 8 ohms. Not going to get a lot out of it in this application

John
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post #6 of 9 Old Jun 30th, 2010, 7:27 pm
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Re: The ultimate....

Quote:
Originally Posted by jzeiler
Wrong part Hoss, you need the #273-1374, 1:1 isolation transformer. Audio device connects across one side the intercom input goes to the other side. It is listed for phone lines but will work just fine in this application.


The one you listed matches a high impeadance to 8 ohms. Not going to get a lot out of it in this application

C'mon, didn't y'all know that?

Brett
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post #7 of 9 Old Jul 1st, 2010, 1:39 am Thread Starter
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Re: The ultimate....

Quote:
Originally Posted by jzeiler
Wrong part Hoss, you need the #273-1374, 1:1 isolation transformer. Audio device connects across one side the intercom input goes to the other side. It is listed for phone lines but will work just fine in this application.


The one you listed matches a high impeadance to 8 ohms. Not going to get a lot out of it in this application

Next time I'm going to fed-ex barbara to you....I think she is cheating on me anyway! dam be'otch!

Hoss
'Stupidity has a knack of getting its way.' --Albert Camus
'05- K1200LT - Gretchen
R.I.P. - '00- K1200LTE- "Barbara" - Retired at 168K 9/2011
MOA, IBA, EXR & RCB and TMI
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post #8 of 9 Old Jul 2nd, 2010, 12:25 pm
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Cool Re: The ultimate....

I Knew, I knew.....

BUT only after looking thru 100 posts going back many years. Thank God for stored data on this site!!

I havent got my 273-1374 installed yet and wont until I get back from Texas but I am hoping that Hoss will have it all figured out by then LOL

Later

Steve A


Quote:
Originally Posted by pkpr1998
C'mon, didn't y'all know that?
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post #9 of 9 Old Aug 4th, 2010, 6:46 pm
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Talking Re: The ultimate....

Finally I have the install working after frying one 2720!

The small isolation transformer works but I need to update some misinformation here. The 2720 and the SP3 is a "4 wire" system like I was originally asking about. Use the transformer on the brown wire and the unshielded bradded wire. The only difference is a volume reduction of approx 25% but I dont get a buzz now.

On a side note dont try a filter on the power lead. I used one and the instructions said to attached the filter ground lead to the frame. The 2720 DID NOT LIKE THAT!!! Its now headed to Garmin to be rebuilt. A $100 mistake.

I hope this helps anyone but I only know of one person besides myself making this upgrade. Even Garmin told me allot of motorcycle people wish the 2720 / 2820 were still being manufactured.

Later

Steve A


Quote:
Originally Posted by jzeiler
Wrong part Hoss, you need the #273-1374, 1:1 isolation transformer. Audio device connects across one side the intercom input goes to the other side. It is listed for phone lines but will work just fine in this application.


The one you listed matches a high impeadance to 8 ohms. Not going to get a lot out of it in this application
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