A bad battery puts a strain on an alternator. A bad alternator puts a strain on a battery. If in doubt change them both and be done with it.
^^^This. You can't condemn the battery by testing it while discharged. Fully charge it first - using a proper charger overnight, not by driving it for 20 minutes - then re-test.You cant check a discharged battery and get any meaningful reading regarding its health. It should have been put on a charger before testing.
Interested where that info comes from, never heard that. Of course, this would be momentary and not for an extended period. How would it ruin the alternator?Disconnecting a battery with engine running will likely ruin the alternator...Just saying
True- 200 volts with nowhere to go (like a battery).It causes a voltage spike which can be bad for anything electronic. Do not do the "disconnect the battery while running" test on a modern car-- or really any car. There are better ways to test an electrical system.
True- 200 volts with nowhere to go (like a battery).
Well, how does it work then? google "does disconnecting a battery on a running engine damage alternator or electronics" or something similar. Be informed- read what it tells you.makes sense, but I am not so sure it works quite like that.
good ole googleWell, how does it work then? google "does disconnecting a battery on a running engine damage alternator or electronics" or something similar. Be informed- read what it tells you.
Well, how does it work then? google "does disconnecting a battery on a running engine damage alternator or electronics" or something similar. Be informed- read what it tells you.
did you get this from google too?True- 200 volts with nowhere to go (like a battery).
The way I understand this to work is that the battery acts as a buffer for voltage and load changes because the load on a cars electrical system is never really constant. And as a result the ECU is constantly altering how much energy the alternator is putting out. The battery absorbs or lets out a little bit of energy when the system load varies, acting as a buffer for the short time that the alternator takes to respond to the requested output change.makes sense, but I am not so sure it works quite like that.
I am with you, but 200 volts? Not sure how that is possible, and devices use no more amps than they are capable of drawing, unless we are talking about ultra high voltage. Interesting.The way I understand this to work is that the battery acts as a buffer for voltage and load changes because the load on a cars electrical system is never really constant. And as a result the ECU is constantly altering how much energy the alternator is putting out. The battery absorbs or lets out a little bit of energy when the system load varies, acting as a buffer for the short time that the alternator takes to respond to the requested output change.
Without the battery, the voltage coming out of the alternator could swing higher or lower than it should during these load changes and requested output changes. And if it swings too high, you burn stuff out.
No. Knew this for at least 40 years- before good ol google. But what difference does this make, anyway? So easy to learn stuff these days with just a little effort.good ole google
did you get this from google too?
great, thanks, have a good oneNo. Knew this for at least 40 years- before good ol google. But what difference does this make, anyway? So easy to learn stuff these days with just a little effort.
Believe what you want regarding high transient voltages that are generated when a disconnect happens. The battery is like a surge protector. Got nothing to do with amperage.
Not gonna argue about this.
I don't think 200 volts would be possible. But as cars get more advanced we get more electronic doodads. And they might be fickle. So while I don't think 200V would be possible, 20-40 might be. And applying voltage significantly higher than rated input can destroy sensitive partsI am with you, but 200 volts? Not sure how that is possible, and devices use no more amps than they are capable of drawing, unless we are talking about ultra high voltage. Interesting.
Here is a very rough analogy to illustrate the principal: the ignition system uses an inductor (the "coil") to take 12 volts and produce 20k volts to fire the plugs. A driver circuit in the ECM or ign. module ("points" in old cars) interrupts the 12 volts. As the magnetic field collapses in the coil/inductor, it induces a secondary voltage, say 20k. Twelve volts now makes 20K volts.I don't think 200 volts would be possible. But as cars get more advanced we get more electronic doodads. And they might be fickle. So while I don't think 200V would be possible, 20-40 might be. And applying voltage significantly higher than rated input can destroy sensitive parts