Here's the finished product.
I woke up this morning at 5:30am - had a cup of coffee and went out to the garage in my sweats and flip flops (I know, not the safest work gear) - and began my soldering task.
For anyone reading this for help - make sure you put the heat shrink tube on the wire BEFORE you solder it - take your time and don't rush things.
I ran the Garmin power cable down through the top (see pics) by my handle bar lock, then up through the center console of my Road King that sits on the tank along the channel where other power is run for speedo, ignition, etc. (see pics) This put me right under my seat where I could connect everything up.
NOTE: I did my soldering away from my bike - I didn't want to risk any solder dropping on the bike at all so I did it on the garage floor. (Since I didn't cut my garmin power cable, I had enough length to drop it to the floor to do my solder work).
I confirmed the pins I wanted (to the left accessory switch), cut one of the ends off of the Y-Cable (Part#72064-94A) so i still have a stock duetsch female connector for other accessories in the future (use the existing rubber cap to plug the remaining connector to keep any debris from entering).
Stripped the wires I was connecting to my Garmin and soldered hot to hot, ground to ground.
NOTE: Before you slip your heat shrink over your solder joint - VERIFY your accessory works. Its a lot easier to "re-do" your work without having to deal with the heat shrink material over your joint.
Once everything was confirmed to work just as I had hoped, I slipped my heat shrink tube over my solder joint and used my daughter's hair dryer to heat it up to get a good seal. I guess i could have used a candle or a match too - but I didn't want to risk burning it. Hair dryer took a lot longer but worked nonetheless.
All that was left to do was tidy up the excess wire and tuck everything nicely away.
Sean: thanks man for your help and support...seriously I don't think I would have been able to get this far, this fast without your assistance.
David
"CHIcagoCOlorado"