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27 votes

Why is gas around a car battery only at risk of ignition from jumper cables?

This is going to get a bit technical but should still be understandable even if you slept through chemistry classes. When is hydrogen dangerous? Just as with the fuel-air mixture in an engine, ...
Edward's user avatar
  • 2,857
24 votes
Accepted

Can one slightly charge a dead car battery with a portable battery jump kit?

As Miracle Max would say, there's two kinds of dead batteries, and there's a big difference between them. Mostly Dead This is the most common kind of dead battery. Let's say your battery is rated for ...
Machavity's user avatar
  • 366
21 votes
Accepted

Why do cars die after removing jumper cables?

It's because of a couple things: The battery is very dead and the alternator cannot put out enough power at idle RPMs to run the whole system and charge a battery. This leads to a lack of power which ...
Cc Dd's user avatar
  • 2,879
19 votes
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No electrical to the dashboard after attempting jumpstart with Schumacher charger

Turns out I didn't read the instructions right (heh). It says to plug the charger in then set to "jump start" wait a couple minutes till it goes from "On" to "RdY" before cranking. https://www....
rogerdpack's user avatar
18 votes
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Can I jump start one car with two other cars in parallel?

To answer your question, it will not cause any issues as long as the cables are connected correctly. If both donor cars are connected in parallel (negative to negative/positive to positive) to the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
17 votes

Can I jump start one car with two other cars in parallel?

When you jump start a car, you are always putting the cars in a parallel circuit. Here's an illustration of parallel vs. series: Source Think of the bigger car's battery as the one on the left and ...
anonymous2's user avatar
  • 5,235
12 votes

Using an Anderson plug to jump start a vehicle

Anderson supplies a whole range of connectors with varying current ratings. Also, current ratings tend to be conservative: these are steady-state ratings. So a 50-amp connector can handle 50 A all ...
Hobbes's user avatar
  • 4,412
12 votes
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Jump-starting a car: connecting black to the engine block

The question says mechanical connections and grounding wires are rarely designed for the high amperage The ground cable goes directly (and only) to the frame in this picture Image from Quora So ...
Weather Vane's user avatar
  • 2,314
11 votes

Can one slightly charge a dead car battery with a portable battery jump kit?

Those types of chargers are designed to provide short bursts of power to start a car, most do not have a battery charging mode. Once the car is started the alternator will complete charging the ...
GdD's user avatar
  • 17k
10 votes
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Why is gas around a car battery only at risk of ignition from jumper cables?

I am no expert in this topic, but I don't think a "cloud of gas" forms around the battery. Hydrogen gas is the lightest gas of them all (0.089 g/l) and won't pool up if leaked. It will simply rise as ...
I have no idea what I'm doing's user avatar
10 votes

Boost car without battery

Did that only work because the cables were such a heavy gauge? Correct. Usually when using smaller gauge jumpers with a battery in the car, you are doing two things. First, you have to leave them on ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
9 votes

Jump-starting a car: connecting black to the engine block

Compare the circuits formed by the two alternatives: positive jumper cable - positive recipient battery terminal - starter relay - starter windings - engine block - chassis - battery ground cable - ...
TooTea's user avatar
  • 541
8 votes

Can I jumpstart a non-hybrid car from a hybrid or full electric car?

Lots of good answers, but will clarify something for what it is worth: All hybrid cars do have a 12V and a high voltage system. In my Prius (2009, 2003-2009 model), the 12v battery is in the boot. ...
Matt's user avatar
  • 81
7 votes

Can hooking up jumper cables incorrectly cause one to have to replace the throttle body?

There's a joke in electronic engineering about transistors being invented to protect fuses. Basically, it means that transistors blow faster, and so a fuse is practically worthless for that purpose. ...
AaronD's user avatar
  • 612
7 votes

Can a lithium-ion battery really start a truck?

I also doubt the numbers they claim on the package but the real question is ... can you start a truck with it? Yes you can! What you seem to forget is that the car or truck you connect this battery ...
Daniel P's user avatar
  • 171
7 votes
Accepted

Can a lithium-ion battery really start a truck?

Yes, Lithium Ion batteries are capable of delivering the power required to turn over an engine. The thing I am most experienced with is the kind of batteries you put in remote controlled devices, so I ...
James T's user avatar
  • 281
7 votes

Boost car without battery

You weren't boosting the dead car, you were powering it totally via some longer leads. The longer leads have losses, so shorter is better. You're right that thinner leads also have higher losses. So ...
Criggie's user avatar
  • 2,958
6 votes

When jump starting a car why not hook up the negative on the donor car last?

Fair warning, this is a guess. Vote appropriately... General accepted order: Dead + Good + Good - (directly to the terminal) Bad - (to a good engine ground, but not the terminal) Avoiding the last ...
JPhi1618's user avatar
  • 13.2k
6 votes
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Can running a vehicle with a dead alternator solely off a jump battery pack cause damage to the vehicle's battery?

TL DR: No. Throw everything you wrote about the voltages and such (in your second paragraph), because really it's kind of moot. The reason is, when you put the jumper pack on, you are putting power ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
6 votes

When jump starting a car, can I attach the negative cable for the car with the dead battery on its body?

Hydrogen is released when a typical car battery is charging. When you remove one jump lead after starting there could be a spark which ignites that hydrogen. It is unlikely to be when you attach the ...
Weather Vane's user avatar
  • 2,314
6 votes

Jump-starting a car: connecting black to the engine block

If you examine your car or any other vehicle, try tracing battery ground cables. Most, if not all, battery ground connects to the chassis nearby, Chassis has a ground cable to engine block. From your ...
F Dryer's user avatar
  • 985
6 votes
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Car won't start, jumping doesn't work, bumping does

It sounds to me as though the solenoid for the starter has gone bad. At the back of the solenoid, there is a large copper washer which comes in contact with the main power lead contact and transfers ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes

Can hooking up jumper cables incorrectly cause one to have to replace the throttle body?

The problem with hooking up the jumper cables backward is that ANY electronic component in the vehicle is at risk. This could mean the throttle body (TB). It could be an alternator. It could be the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes

Using an Anderson plug to jump start a vehicle

The Anderson plug will handle the Amps if selected properly. Paulster and Hobbes have stated this. I know that the Anderson plug is good for its stated cont rating because I do a lot of work for the ...
Autistic's user avatar
  • 2,083
4 votes

Chevy Cobalt key stuck in ignition, battery dead

If you look up from underneath the steering column there is a hole where you can push a button or a tab to release the key with a srewdriver.
Willie's user avatar
  • 41
4 votes
Accepted

Car wont start unless I use jumper cables but battery is fine

It very well can be a bad battery even though the lights come on. Starting the car is the single hardest thing (draws a lot of amperage) for the battery to do. If it is becoming weak, it will become ...
CharlieRB's user avatar
  • 9,015
4 votes

Why do cars die after removing jumper cables?

Vehicle behavior depends on the two types of alternators: A vehicle with a self-exciting alternator (aka one-wire alternator) will run without battery power. This describes my Honda and most Chevys. ...
kmarsh's user avatar
  • 2,159
4 votes

Why do cars die after removing jumper cables?

The majority of cars built in the last 10 years have what is known as a smart charge system, i.e. the alternator only puts out what the consumers demand. With a totally flat vehicle and a donor car ...
John Billington's user avatar
4 votes
Accepted

Can you pushstart a hybrid / fully electric car?

There are two reasons why a modern hybrid car could fail to start due to lack of electricity. Two reasons, because every hybrid car has two batteries (12V and HV). One is that the 12V battery is flat....
juhist's user avatar
  • 14.6k
4 votes

Is my moto's battery dead?

If your motorcycle had never it's battery changed you should consider it being dead. Not being able to charge it could confirm the same. You should be having a new battery installed and if you plan on ...
kokobill's user avatar
  • 1,005

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