I added the separate wire from the R/R to the battery several years ago with positive results, but with my Gerbings heated jacket liner, pant liners and gloves running at a high power level, it is possible to exceed the alternator's available output and discharge (ask me how I know) the battery. At 80 mph (my interstate crusing speed), the engine is using a higher percentage of the available power for the ignition system in relation to the max (around 3000 or so RPMs)alternator output. Therefore, the faster you rev the engine (using more ignition current) above the rpms that the alternator maxes out, you actually have less available power for accessories. Early BAs/Speedys like my '02 suffer more than later ones that came with an upgraded stator. So far, I have not sprung for the later stator. Our beloved bikes don't have much charging power for stuff. Heated clothing for two up riding would surely kill your battery. I have just learned to deal with it. Add the wattages of the headlight, taillight and ignition system, then subtract from the max available alternator wattage posted earlier in this thread and you have the power available to recharge the battery from starting loads and to power your accessories. When the battery voltage drops below the ignition system's minimum threshold, the bike will cut off, even while you are riding at speed.
