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#101
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Need ways to start a car with a dead battery.- 92 Civic Auto.
In article .com>,
Ricky Spartacus > wrote: >"Matthew Russotto" > wrote >> Kaz Kylheku > wrote: > >> >You do understand that when you push-start a car, that causes the >> >alternator to spin, which generates electricity, right? > >> You seem to be a little behind. If your battery is actually dead, the >> alternator doesn't generate electricity when it spins. > >For one thing, if an alternator needs power to its field >coil in order to work then how did the car run without >the battery? If you start a car and disconnect the battery, it will remain running off the alternator. Once it is running the alternator does not need _external_ power to its field coil. However, note that the battery does provide some voltage regulation to the whole system, so electrical devices may behave erratically if you don't have the battery in there. (seen it myself) -- There's no such thing as a free lunch, but certain accounting practices can result in a fully-depreciated one. |
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#102
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Need ways to start a car with a dead battery.- 92 Civic Auto.
In article >,
Don Bruder > wrote: >In article >, > Nate Nagel > wrote: >> >> you probably can't push start an alternator car completely without a >> battery, unless there is enough residual magnetism in the field coils to >> allow the alternator to bootstrap itself. > >At which point, the diodes will probably go up in smoke, leaving you >with a dead (if present) battery, *AND* a dead alternator. > >Running an alternator no-load/micro-load is a great method of letting >the magic moke out of the diodes. The other electrical accessories are enough to keep the diodes from going up in smoke. Been there, done that, when a battery wire terminal corroded all the way through. -- There's no such thing as a free lunch, but certain accounting practices can result in a fully-depreciated one. |
#103
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Need ways to start a car with a dead battery.- 92 Civic Auto.
In article >,
Mike Romain > wrote: > >On 'modern' vehicles, if you disconnect the battery, the open ended >alternator surge 'will' destroy the computer, ignition module, stereo if >turned on and any other electronic part active before the alternator >itself smokes out. No, it won't. I've had a battery terminal corrode through and nothing of the sort happened. Granted, that was not a completely modern car (electronic ignition, but carbeurated). I've also run a modern car with a battery which was damaged and not taking a charge; while the gauges acted erratically and the car idled badly, it was not instantly damaged. -- There's no such thing as a free lunch, but certain accounting practices can result in a fully-depreciated one. |
#104
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Need ways to start a car with a dead battery.- 92 Civic Auto.
I have seen a mess of newer ones killed like mentioned....
Carb engines are different animals. Mike Matthew Russotto wrote: > > In article >, > Mike Romain > wrote: > > > >On 'modern' vehicles, if you disconnect the battery, the open ended > >alternator surge 'will' destroy the computer, ignition module, stereo if > >turned on and any other electronic part active before the alternator > >itself smokes out. > > No, it won't. I've had a battery terminal corrode through and nothing > of the sort happened. Granted, that was not a completely modern car > (electronic ignition, but carbeurated). I've also run a modern car > with a battery which was damaged and not taking a charge; while the > gauges acted erratically and the car idled badly, it was not instantly > damaged. > -- > There's no such thing as a free lunch, but certain accounting practices can > result in a fully-depreciated one. |
#106
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Need ways to start a car with a dead battery.- 92 Civic Auto.
"Mike Romain" > wrote
> I have seen a mess of newer ones killed like mentioned.... > Carb engines are different animals. Years ago, my 260K miles, 1988 Honda Accord fuel injection battery cable was cut by the fireman who was at the scene of the accident. The car idled smoothly for maybe 10 minutes until I'd shut it off. I still drive it today. I believe there is a button you can push on these alternator to go full field. Otherwise, they're self regulated. Last I'd checked, the voltage never exceeded 15V when idling with the battery cable unplugged. |
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