Jump Start
#13
03-21-2013, 08:06 PM
This has nothing to do with voltage being the same, it's about the 100+ amps the jump vehicle can supply into your bike's 30-40 amp system. Harleys use shunt type voltage regulators, which means your bikes 30 - 40 amp regulator may try and shunt 100+ amps to ground if its regulation threshold kicks in before (at a lower voltage) the jump vehicles regulator.
You may get away with it this time, but you risk frying the bikes regulator.
#14
03-21-2013, 08:08 PM
DO NOT jump from a running car or truck.
This has nothing to do with voltage being the same, it's about the 100+ amps the jump vehicle can supply into your bike's 30-40 amp system. Harleys use shunt type voltage regulators, which means your bikes 30 - 40 amp regulator may try and shunt 100+ amps to ground if its regulation threshold kicks in before (at a lower voltage) than the jump vehicles regulator.
You may get away with it this time, but you risk frying the bikes regulator.
This has nothing to do with voltage being the same, it's about the 100+ amps the jump vehicle can supply into your bike's 30-40 amp system. Harleys use shunt type voltage regulators, which means your bikes 30 - 40 amp regulator may try and shunt 100+ amps to ground if its regulation threshold kicks in before (at a lower voltage) than the jump vehicles regulator.
You may get away with it this time, but you risk frying the bikes regulator.
#16
03-22-2013, 12:49 PM
Seasoned HDF Member
DO NOT jump from a running car or truck.
This has nothing to do with voltage being the same, it's about the 100+ amps the jump vehicle can supply into your bike's 30-40 amp system. Harleys use shunt type voltage regulators, which means your bikes 30 - 40 amp regulator may try and shunt 100+ amps to ground if its regulation threshold kicks in before (at a lower voltage) the jump vehicles regulator.
You may get away with it this time, but you risk frying the bikes regulator.
This has nothing to do with voltage being the same, it's about the 100+ amps the jump vehicle can supply into your bike's 30-40 amp system. Harleys use shunt type voltage regulators, which means your bikes 30 - 40 amp regulator may try and shunt 100+ amps to ground if its regulation threshold kicks in before (at a lower voltage) the jump vehicles regulator.
You may get away with it this time, but you risk frying the bikes regulator.
#17
03-22-2013, 01:04 PM
With the newer EFI bikes you definitely DON'T want the car running when you jump. It may not have mattered much with the earlier more simple carburetor bikes but it does with newer bikes.
I've experienced that you can't bump/push start and EFI bike because if the battery is dead or nearly dead it doesn't have the juice to power the fuel injectors. When it happened to me we were able to bump start it and she ran for about 15 feet which was all the gas left in the fuel injectors. What I've had to do is allow the battery to build up some charge my connecting it to a good battery. motorcycle or car, (with no vehicle running), for 15 or 20 minutes to allow the dead battery to get a small amount of charge first so the fuel injectors will keep the bike running once you jump start it.
If you are jumping from another bike, have the good bike running when you attempt the jump. But if jumping from a car be sure the car is always off because of the amount of amps the car puts out. Or "poof" goes your electrical and the computer.
I fried my Sportster's regulator from having the jump car running.And I jumped the Road King from a non-running car but only got about 10 feet before it stopped because I didn't first charge my battery some so the EFI would feed the engine.
I've experienced that you can't bump/push start and EFI bike because if the battery is dead or nearly dead it doesn't have the juice to power the fuel injectors. When it happened to me we were able to bump start it and she ran for about 15 feet which was all the gas left in the fuel injectors. What I've had to do is allow the battery to build up some charge my connecting it to a good battery. motorcycle or car, (with no vehicle running), for 15 or 20 minutes to allow the dead battery to get a small amount of charge first so the fuel injectors will keep the bike running once you jump start it.
If you are jumping from another bike, have the good bike running when you attempt the jump. But if jumping from a car be sure the car is always off because of the amount of amps the car puts out. Or "poof" goes your electrical and the computer.
I fried my Sportster's regulator from having the jump car running.And I jumped the Road King from a non-running car but only got about 10 feet before it stopped because I didn't first charge my battery some so the EFI would feed the engine.
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