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Many motorcycles that are newer have a built in safety device that keeps the bike from starting when the battery is too low to keep from burning out components from running low on voltage. Can you hook a battery charger to it and have it start or is it just turning over and not starting? Without any details about your problem it is hard to troubleshoot. Has the bike been ridden recently, has it been setting so the carb is gummed up, is it fuel injected, does it have an electric fuel pump?
When you try to start the bike, does anything happen? Noises? Clicks? Or is it silent and nothing happens? If you hear a click or it try's to start but doesn't turn over. If nothing at all happens when you hit the start switch then you most likely have an electrical issue, versus if you hear the starter click or try to start to bike, then that would mean a mechanical issue.
Most likely it is your battery. If it started when you jump started it then the battery was too weak, and it won't hold a charge, so when you park it overnigt it is not strong enough to start the bike. You may have loose or corroded cables and that can lead to a weak battery because it wasn't getting charged like it should. Unfortunatly when bike batteries get that weak they usually need replaced. Unlike a car battery they can't take the punishment of improper charging.
put a volt meter across the battery terminals, should read over 12v stopped and rise to 13.5v with the engine running.
If the voltage doesnt rise there is a problem with the charging circuit.
Be carefull starting from a car, as this can cause damage to the bikes electrics, as the bike tries to produce enough amps to charge up the car when the bike starts, and overcook electrics.
lol you have a short drawin all your power.. check the ground of lights ... you may have also killed the start solenoids with too muck power.. use a voit meter it isolate our problems...
Remove battery and get it charged the tested..More likely its failed. when engine is running check battery voltage it should be 12.8 to 14.2 volts with good battery
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