Lead acid battery charger (or alternator) switching to trickle with (2025 Update)

But it didn't work. Stop start activities like short shop runs, taxi drivers, etc, everyone got flat batteries. Modern cars presumably do a fast charge after starting. So they need to know when to slow down the charge rate.

Wrong, I've f****ng well measured it myself, for the fifth time!!

The OP clearly has with his 2002 Renault. Hardly a new car.

To avoid over charging the battery, f****it.

Alternators were no in fact used for the best part of the last century.

Basically all cars before say 2010, the alternator VOLTAGE is regulated to 13.4 to 14.5 volts and the battery draws as much current as it need to, to charge. When the battery is fully charged it draws only a small current. The exact voltage the alternator is regulated to actually changes a little with temperature, up a little in cold down in hot. That battery university web site has a lot of good detail.

BUT,

I did hear that some newer cars have some weird mode where the computer sets the alternator to a lower voltage as a fuel saving measure. That may be what the poster was seeing.

What year was the car you saw this behavior?

snipped-for-privacy@yahoo.com wrote

The OP's 2002 Renault clearly isnt.

Voltage gives you no information about the size of the load.

And the alternator/VR doesn't care about the size of the load, it's job is to maintain a target SYSTEM VOLTAGE. That's why they call it a VOLTAGE REGULATOR stupid.

BS. I simply told you that the traditional alternator/vr that has been used for half a century simply targets a system voltage and maintains it. Many other, Xeno, Clare, MAko have told you the same thing, but you won't listen. And I said there may be more modern ones that do more, so YOU go find the info and show it to us, instead of wandering in the wilderness with the Aussie troll and making things up.

You don't need to do that to keep a car battery charged as evidenced, again, by the traditional VRs that didn't do that.

Go f*ck yourself. YOU go find what you claim exists and how it works.

You have no f****ng idea what your car does or does not do. You saw a voltage change which could be due to many things, including LOADS in the car turning on and off.

I agree, both with how traditional VRs worked and that newer cars may have something more advanced. What I disagree with is people making up pure BS, speculation, and then asserting it as fact. That fool Kinsey even dismisses the idea of supplying some cites or references. And also it's obviously not essential to do a new method, because the traditional dumb VRs worked for more than a half century with the same lead acid batteries. There is no need to back off to trickle charging, etc.

How about go f*ck yourself then?

You're clearly clueless about the complexity of modern cars and all the electrical loads.

I didn't say I can't believe it, I said if it's so, then show us the references. And I said if they do it, I doubt they do it via using the resistance of the battery cable, which is what Rod claimed.

So, you'd rather be like Rod, speculate, BS, flap gums. Figures.

Different lead acid batterys in fact.

But if the system deliberately charges more aggressively initially so that the battery is more fully charged with start stop driving, particularly with engines that now are stopped automatically when the car is stopped at the lights etc, it may well be very desirable to back off that charging when the battery is charged.

You;re his butt buddy, you're the one here defending him, now you say that?

Again, another diversion and obfuscation. I didn't say anything about overloading anything. I simply said that the voltage changing at the battery could be loads in the car changing.

I said his claim that they use the resistance of the battery cable to measure current flow is highly doubtful for obvious reasons. Someone else had to explain that to you. And if that's what they do, use the battery cable to measure current, then why don't you or your butt buddy show us some REFERENCES? Instead of just pulling things out of your ass?

Go f*ck yourself. It's quite obvious you're beyond clueless.

Why are you adamant about this, when you have ZERO to show that it's done? There are obvious reasons why it;s not likely. Try Ohms's Law.

You fool, he hasn't said on what basis he even makes this claim.

Was Rod right about this:

How can one dope be wrong on so many things?

The 737 MCAS doesn't rely on just one AOA sensor (It does)

The FAA would never approve that design (They did)

The data from the FDR on Lion Air has not been released (It was in Oct/Nov)

Boeing doesn't know what caused the Lion Air Crash

The 737 can't be trimmed mechanically (It can)

It's impossible to have a design where it's both electrical or mechanical trim (BS because all 737s and most other planes have both)

The Cessna 150 can't stall (It can, stall speeds are listed by Cessna)

Denies that it's common for FAA to put out directives soon after a crash, requiring inspection of what they believe caused the problem in all similar planes in service. (Of course it's common)

The AOA sensors were a known problem with the 737 Max and were already being replaced at the time of Lion Air crash (total lie)

The FAA didn't ground the 737 Max, Boeing did. (Trump announced the FAA grounding we have it on video)

Pilots are required by law to read the manual in an emergency, before taking action. (speaks for itself)

You have a 50" CRT TV (posted lame pic of a much smaller TV, no tape measure, no model, nothing to verify it

Electric pole transformers can glow orange hot, it's not uncommon (Still waiting for the pics of some of those)

Former leaders have no say in the details of their state funeral (beyond stupid)

The tax rate on capital gains was 93% after WWII (It was more like ~45% max and in the 50s was reduced to just 25%)

No one was buying US manufactured goods just after WWII. (ie the US didn't have a huge advantage as a manufacturing economy with much of the rest of the world destroyed following WWII. Obviously more total lies and stupidity)

Investment isn't for capital gain.

Then you wont have any difficulty listing all those countrys buying US manufactured goods just after the war had ended. (implying that the US wasn't exporting manufactured goods after WWII, as much of the rest of the world was in rubble and rebuilding)

Digital Equipment Stock DEC, was never sold for a capital gain.

The 911 terrorists didn't need flight training, anyone can fly a 767, just use a PC simulator to learn.

you don’t even know that there even was a doctor involved with Obama's birth certificate. (it's signed by Dr. David Sinclair)

No doctor signs the birth certificate, f****it.

Hardly any presidents have one term. (Ford, Carter, Bush 41,

President Trump invited himself to visit the UK

NYC still dumps all it's trash in the ocean

There isn't enough glass from recycling to use it for concrete

The Autobahn, a highway, is an example of socialism.

The financial crisis in 2008/09 was not caused by bad loans.

We have no idea how many companies Trump has (it's 500+ from his disclosure)

Trump has one company.

Ipe wood doesn't come from rainforests.

Obama didn't impose any restrictions on Bill Clinton's speaking engagements and fees.

There is always more than one wire going to the positive terminal of a car battery.

What a total moron!

My Toyota has one of those on the positive battery cable. It is an inductive sensor.

Yes, it is on the main current path to the electrical system. Due to its location, it cannot sense starter current but that is no big deal since that is not its purpose anyway.

There are a lot of different computer controlled charging strategies out there. I am not well up with them since I retired 18 years ago and lost access to all the factory technical information I was once privy to.

It is a fuel saving measure. Also, some systems have a 3 stage charging system - charging, trickle and float. This is very beneficial when you have two batteries with only one being a starter battery. A lot of 4 wheel drives for instance.

Why do you think it has to be one or the other? He's irritating and I've killfiled him a few times, but he's the only one who answered my question in this thread.

The voltage is fixed by the alternator unless it's overloaded and can't provide the charging voltage.

Nobody has explained it. A wire has resistance, it has a voltage drop, very easy to measure.

What is this obsession of proof you have? Are you a lawyer or something?

You have not explained how my car behaves, Rod has. You lose.

Ohm's law (which I've just spelled correctly, there is no Mr Ohms) is precisely why it works. If you connect a 12V source at one end of a thick cable, and run a 50 amp load at the other end, you'll only get 11.5V at the other end. I know, I've installed 6kW car stereos. Voltage drop is a problem, especially on the peak of the amp's consumption with music which has loud beats.

Ohm's law for a start.

I really don't care about all that, you sad stalker.

Can't work, battery would boil over giving it 14.4V all the time.

Are they all the same person?

Never seen a post from "MAko".

Stop yelling. Do you actually speak like that, EMPHASIZING words for no reason?

Unlike you I don't need proof, I just need an answer which makes sense.

You don't need it to keep it charged, but you do if you want to charge it quickly, for example on short runs.

Awww, is usenet too hard for you?

Stop yelling.

I didn't claim it, Rod did, do keep up at the back.

Nothing turned on and off. I started it and left it idling in my driveway. And since you claim the alternator maintains a stable voltage, that wouldn't change even if I did draw a load. In fact it doesn't even if I switch on all the lights, the heaters, etc.

On Tuesday, June 25, 2019 at 9:20:37 AM UTC-4, Commander Kinsey wrote: full, and you claimed it could do this by just sensing voltage

Who said it had to be 14.4, f****it?

That's why you're a f****it, so just blindly follow Rod, you got your answer, so what's the problem?

True, only sensible people need to keep their car batteries charged, f*****ts don't.

but you do if you want to charge it quickly, for example on short runs.

But YOU accepted it, without any references! And then like a true f****it, you dismissed any need for references!

Modern cars have all kinds of loads f****it. For example, how about heaters in the O2 sensors that power up at starting, then later turn off? How about air injection pumps? Fans? Coolant pumps for the heater core?

And since you claim the alternator maintains a stable voltage, that wouldn't change even if I did draw a load. In fact it doesn't even if I switch on all the lights, the heaters, etc.

I didn't claim all alternators maintain a fixed voltage. I specifically said that some modern cars may use more advanced systems, that they might want to do that to conserve energy and squeeze a tiny bit more MPG out. Do you even read what I post? What I said was that the typical dumb alternator/VR that has been used for over half a century was not smart, didn't measure the current going into the battery, just targeted a fixed voltage and to keep the battery charged over it's normal life, that has obviously been sufficient. Capiche?

BTW, why can't you trim posts?

It fixes it, keeps it close to a target voltage, that doesn't mean that the voltage can't change by a fraction of a volt due to loads.

A lot brighter than you, who prefers the flapping gums of Rod the troll and dismisses references as unnecessary.

Again, run the numbers, f****it.

Sure, because you're a f****it that listens to Rod who has a reputation for BS and you dismiss the need for any reference. The voltage change you claim you saw was due to fairies from Mars. See how that works?

Sure you can, ROFL.

So, why are you still here? Rod gave you his BS answer, you accepted it.

Again, if you just applied Ohm's LAw, you'd see that resolution isn't sufficient, f****it. And even if it was, how logical is it to try to measure down to a milivolt in a car? A car where loads are constantly switching? When either you or Rod have a reference that says auto manufacturers use the battery cable resistance to measure voltage, let us know. Until then, f*ck off. BTW, still can't trim posts?

Depends on the temperature and how many attempts, and if you've used things like lights when the engine is off. Why do you think older cars used to get flat batteries on short journeys? They didn't charge as much as they'd used.

Stop your pathetic childish stalking.

It's not "too bad", it just goes to show you're not too bright.

You moaning about it you stupid left wing moron.

Not significantly.

It most certainly isn't to "save power". WTF are you on about?

No they didn't, they didn't charge fast enough.

It's true for all the approximately 10 cars I've owned, I've never seen a car with only one wire. Why on earth would they bother fitting a seperate junction box away from the battery? You've got power flowing to and from the battery in different directions throughout the vehicle, might as well just join them at the battery, which is the device that smooths out the fluctuations and stores the extra power.

If you don't understand that there's a voltage drop with large currents flowing through a wire, there's no hope for you.

Then what are you moaning about? At the most, I left in one more level than you desired, or you would have trimmed it last time.

Mine changed from 14.4 to 13.8. That would not happen with a regulated alternator just due to loads.

Not my fault I don't have OCD.

Ok, I'll "run the numbers" which I assume is American for "do the calculations": Here's some typical battery cables:

You dismiss Trump, that makes you as stupid as the Jews.

To prove you're a fool. Seems Rod can't be bothered with you. Maybe he has less patience than me.

You can trim too can't you? Why don't you do it yourself?