Need Help Connecting a 2720 on my 05 LT - BMW Luxury Touring Community
 
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post #1 of 6 Old Jul 27th, 2007, 1:03 pm Thread Starter
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Question Need Help Connecting a 2720 on my 05 LT

My 05 came with the cradle on the radio. I just installed an Autocom Pro 7 Sport.
I bought a 2720 that I will mount to a BMR shelf instead of the cradle, re-using the cable that came with the cradle.
Under the stingray and to the left of the bike are the radio connectors. Next to them is a 4 position connector that has a plug at the end. I suspect this is the wiring for the BMW GPS. The cable from the cradle has 3 wires (red, brown, purple) and was hooked as follow by the PO (or dealer):
- Black wire from the cradle connected to brown on the bike side
- Red wire from the cradle connected to blue/purple on the bike side
(these appear to be the positive and negative that power the GPS)
The 3rd cable form the cradle is purple and not connected to anything.
I am assuming this is the voice output cable and I am wondering if I can connect it to one of the remaining wires wich are green/black and blue/green (or green/blue.
Can anyone who re-used the factory cable let me know how they connected the voice? I need to finish that connection and pout the bike back together.
Thank you!

Gilles & Kathy
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post #2 of 6 Old Jul 27th, 2007, 2:34 pm
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Connecting Garmin

Gilles

I have not done this but it does seem as though an audio ground is missing unless it is shared with the units ground. This link shows what you may need http://www.cycoactive.com/ram/ram26.shtml and then it mono to mono jack from radio shack into the Autocom.

Good luck

Graham Wintersgill
On the bonnnie bonnie banks of Loch Lomond

2001 K1200LT

1995 K75RT now deceased
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post #3 of 6 Old Jul 27th, 2007, 3:36 pm Thread Starter
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Quote:
Originally Posted by grahamw
Gilles

I have not done this but it does seem as though an audio ground is missing unless it is shared with the units ground. This link shows what you may need http://www.cycoactive.com/ram/ram26.shtml and then it mono to mono jack from radio shack into the Autocom.

Good luck
Thanks Graham. It seems that the PO clipped whatever connector was at the end of the factory cable, and I think you are correct about the audio ground being shared with the unit ground. Perkaps I should just try to solder in a 3.5 mm Audio jack and I should be in business after connecting a mono cable from there to the Autocom unless I can figure out a way to connect the purple wire to the radio somehow...

Gilles & Kathy
BMWMOA# 154719
IBA# 71594
2011 Ostra Gray RT
06 Mercedes-Benz E350 Estate (parts and people hauler)
2012 BMW X3 (parts and people hauler)
86 Porsche 911 Cabriolet (my "new" baby)



For her I climbed the highest mountain!
For her I swam across the deepest ocean!
For her I walked through the largest desert!
And then she left me... She said I was never home!!!


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post #4 of 6 Old Jul 30th, 2007, 9:09 pm
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Gilles & Graham,
This is not exactly the info you both have talked about, but. The unique 8 spring pin connector that Garmin uses on my 2720 does have separate ground for audio and power. The connector is slightly triangular with the hypotenuse slightly expanded and has 8 gold spring pins. This slides into the fitted slot for it on the back of the 2720. Pin 1 (far from the narrow end) is audio hot, pin 2 is audio ground, pins 3 thru 6 are nc on mine. pin 7 is power ground (black) and the last pin is 8 and is 12 to 24 vdc for input (red). On my cable, beyond the pendant 2.5 mm mono audio out there were 2 wires cut off nside the shield white and brn) and neither connected to the 8 spring pin plug. And, lastly the shield had no contact (it is a floater). I shortened my cabling greatly therefore it was easy to check this.

Carl

K1200LT w/ KLT s/c
K1100LT w/ ECC
KLR-650

N9BMN
FD <> 4%
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post #5 of 6 Old Jul 31st, 2007, 7:02 pm Thread Starter
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Thumbs up

I decided to take Graham's advice and got a new cable that has the audio jack.
It seems much simpler than trying to make one myself as my soldering skills never were that great to begin with...
I already have the bike pre-wired with the mono cable going to the Autocom.

Gilles & Kathy
BMWMOA# 154719
IBA# 71594
2011 Ostra Gray RT
06 Mercedes-Benz E350 Estate (parts and people hauler)
2012 BMW X3 (parts and people hauler)
86 Porsche 911 Cabriolet (my "new" baby)



For her I climbed the highest mountain!
For her I swam across the deepest ocean!
For her I walked through the largest desert!
And then she left me... She said I was never home!!!


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post #6 of 6 Old Jul 31st, 2007, 7:07 pm
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Hey... good luck, Gilles! I'm sure you'll sort it out...

...............
J.M.J...
Dcn Channing

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