Join Date: Jan 2006
Location: Birmingham, Alabama, USA
Ok, I have found something that may help you, but not exactly what you asked for.
In Appendix B, page 55 of my Street Pilot III Owners' Manual there are a couple of diagrams. They indicate:
Brown to be the Serial Data Out
White to be the Serial Data In
Black to be the Ground
Red to be the Power
You are looking for B+ ???? I am going to take a stretch here but I am assuming the B+ stands for the Brown wire which would be a positive feed.
Now in another diagram there is the round 4 pin plug. The little line or notch on the side of the plug (for lining up purposes and allowing it to be inserted into the unit in only one way) is aimed at the 8:00 position with the four holes staring you directly into the face.
After lining it up, note that the 12:00 pin is the ground, the 3:00 pin is the Data Out, the 6:00 pin is the Power and the 9:00 pin is the Data In.
If nothing else, perhaps this will allow you to track the wiring backwards toward the battery on the bike. If you have lost all power, I am assuming the positive is disconnected or that a fuse has blown. Of course you seem concerned with the B+ wire, which as discussed, I am only assuming is the data out wire.
I am also assuming the dealer wired the harness as per this diagram.??
One additional thought. Are you sure you are looking for the B+ wire?? The Black wire which I think would be B- is the ground. If your ground is dsconnected or shorted out, you would lose all power.
Again, good luck. Hope this helps a little.
2003 R1150RT, Black Beauty--this is one sexy bike!
1999 R1100GSA, Does everything well, what else can one say?
1992 K75SA, If this engine had been 4-valve instead of 2, it would be the smoothest BMW ever built!
1978 R100S, my first and favorite BMW.
1976 R75/6, A 30 year old gentlemen I still love to take out for a Sunday ride.
Last edited by bmwrubbercow; Sep 22nd, 2006 at 9:01 am.
Reason: Additional info