Much thought and process has been discusses regarding the stock
factory speaker wires, where they're found and what colors, so on,
since my search button never finds the info quick enough, I thought
I would repost some of the data for reference.
this is for the current "Infotainment" system models ( classic radio )
reference Touring Models manual page B-26 pullout towards the back.
most people directly access front speaker outputs by removing the wires
from the speakers themselves. there was an error found on page B-26 so bear with me,
maybe the reason so many peoples radios have died an untimely death.
small connector on the back of the radio, already plugged in on custom
models, pins listed from right to left, up then down~,
1 RT front negative - LGN/BK
16 LFT front positive + W/O
17 LFT front negative - LGN/W
18 RT front positive + GY/R
larger connector on the back of the radio, referred to as the unused connector
or 35 pin connector, it's number labeling system is the same
1 RT rear positive + GN
2 LFT rear positive - BN
24 RT rear negative - LGN/BN
25 LFT rear negative - W/BN
it's not necessary to make a rear speaker connector, the pins are already hot and a properly insulated molex pin can be
pushed on to access those wires, or connector purchased and mini DIY harness made.
please feel free to help me add the p/n's update this or make corrections,
goal being a reliable SPEAKER WIRING QUICK REFERENCE
wiring harness connector parts related to classic radio found here, at namz customs
on to the error found: on section 34A/34B
the manual shows the RT front speaker as being wired backwards, I've stated it, others have said it, but it's worth noting, you should more than likely correct that error or you will have some issues, whether you are installing $50 upgrade speaker or $2800 fantasy kit you saw at a bike show. mine and several other radios have died in the process and if you are out of the 10k mi warranty range it might be costly.
so those are the codes and colors and locations