I had the same problem back in April while out riding with some friends. We were doing about 60mph and the Ol' Chap just died. Pulled over and it fired right back up, did this 2 more times that day. That evening I pulled into the garage and hooked it up to the battery tender like I normally do. Now the charger usually kicks over to green fairly quickly. The next morning as I was leaving for work I noticed it was still yellow so I knew there was an issue. Turns out I had a loose negative terminal cable. I hadn't touched them since I changed the battery two years ago, tightend it up and have been good ever since. That ought to be a lesson to us to go over out bikes on a regular if not at least annual basis. I for one am bad about just hopping on it and going.

2006 865 Neon Blue/Jet Black Speedmaster,790cams, TTP Stage 2 Firestarter, Epco Exhaust with 10.25" Samson Vrod baffles, UNI pods with 40 pilots, 150 mains,Thruxton needles, 3 turns out.