I've heard that when jump starting a motorcycle from a car, or jumping any vehicle that could have a lower amperage designed system than the "one doing the jumping", one should always have the "jumping vehicle" NOT running. Otherwise it could damage the diodes in the lower amp system, as well as possibly damage the charging regulator of the weaker system.
I realize the some car alternators can put out way higher amperages than most motorcycles, but I'm a bit confused on how the amp consumption of the lesser vehicle would draw said "available" amps from the larger system.
I.e. it's all still 12 volts, it appears to my novice intelligence that the motorcycle starter would still only pull the needed amps offered by 12 volts, regardless of how high the amperage capacity of a the "jumping" alternator (and or high amp battery). (?)
Further how is 12volts (14 to 15 running) of (anything) going to force itself back down the throat of the lesser regulator line (?)
Obviously I am not seeing something.
I realize the some car alternators can put out way higher amperages than most motorcycles, but I'm a bit confused on how the amp consumption of the lesser vehicle would draw said "available" amps from the larger system.
I.e. it's all still 12 volts, it appears to my novice intelligence that the motorcycle starter would still only pull the needed amps offered by 12 volts, regardless of how high the amperage capacity of a the "jumping" alternator (and or high amp battery). (?)
Further how is 12volts (14 to 15 running) of (anything) going to force itself back down the throat of the lesser regulator line (?)
Obviously I am not seeing something.