2005 Speedmaster, i have inadvertently left my ignition on and flattened the battery, so i have jump started it off a car....no problem there, but when i let the jump leads go it stops immediately, i thought that once running the alternator would take over and everything would be ok, the battery would charge and that would be the end. but no, the engine stops straight away. is it possible that the battery is now too flat to recover and this is causing the fault? is there a minimum charge needed within the battery? or is there another problem? (i have checked all the fuses..... no problem there)..... HELP Please
Motorcycles - Triumph - Speedmaster - 2005 Triumph Speedmaster
Answers & Comments
These are possibilities and a speculation. The charging system on the newer British motorcycles is so much better then the early years but I suspect with a flat battery the charging system just can't keep up to the demands. This meaning charging the battery and running the electronic ignition and possibly a computer, which requires at least 10 volts to run. It's not like a car with 100+ amp alternator and my suggestion is to put the battery on a medium charge for hours not a fast charge. Use like a 10amp charger with a battery tender and let it do its thing. If you keep jumping it and disconnection the jumpers two things are possible you destroy the charging system and or burn out the computer/electronics. If the battery is five years old it's pretty well used up and may not survive this ordeal, however if it's a fairly new battery say in the last two years the chances of survival are much better.