Great Source for SAE Electrical Stuff
I have been working on "farkling" my BMW in order to better support stuff like my GPS, iPod, etc. In doing so I have looked quite a bit into setting up my various power needs around the SAE-2 12v plug, like the popular Battery Tender uses.
I have found a small shop that has some very useful stuff related to SAE-2 stuff. He sells his stuff mostly on ebay.com. You can find stuff by going to ebay.com and searching for "motorcycle sae 2". The link to his ebay storefront is
FYI, I have never met this guy before or have any business contact with him. I've just found him quite responsive to my emails asking questions and like the configurations of SAE-2 gear he has for sale.