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18

From an electrical perspective, it doesn't matter. However, a lead-acid battery that is charging or discharging rapidly will give off hydrogen, which is highly explosive. Since you generally make the ground connection last, there's a good chance that you'll get a spark, which is enough to ignite the hydrogen. So while it's unlikely that you'll have ...


10

Chris makes a very good point regarding the hydrogen given off by the battery. There's also another reason, especially on older cars. Ground straps to the engine on most cars are notorious for corroding, so by hooking up the negative terminal to the engine you'll increase your chance of getting the maximum current flow when you're trying to crank the engine. ...


8

Your car thinks it is being stolen - jump starting a car looks a lot like hot-wiring a car to the computer. You need to do something that tells your car "it's OK, I own you". You can do this right after hooking up the cables, but before starting the engine, to minimize the annoyance to your neighbors. If you have a remote door key, lock and unlock the ...


8

Sounds to me like your starter motor is on the way out, as you are getting enough power, as a bump start is working, and sometimes you are able to start normally. This isn't that uncommon - they do take a lot of stress and load, and the internal friction can end up being too high for them to cope with. A temporary fix I have used in the past is to whack ...


6

You can get transient spikes from the other car while it's trying to start. Any battery or alternator issues that affect power quality will be transmitted to your car. The good news is that large 12v batteries make excellent buffers against power issues that might otherwise cause damage. However, it is still possible to suffer damage to your car from ...


6

The biggest thing to look at for me is the gauge of the wire. The reason I bring this up is, the higher the gauge (numerically) the thinner the wire. Thinner wire will require your jump-start procedure to take more time, as it takes a while to charge the battery before you'll have enough juice to get it running. Thinner wire cannot pass enough amperage to ...


5

Your description of connecting the two cars is correct. I want to emphasize making the last connection to the "bolt head" you mention. Any large piece of unpainted metal will do. The reason for this is to keep the resulting spark away from the battery. If they battery has been venting fumes, the spark can (although very unlikely) cause them to ignite and ...


4

Editing my answer It had happened to me a couple of time and common symptoms that I found are Loose Battery Connection Somehow the battery terminals got loose, tighten it and it will solve the problem. It happened to me before. Jump Start In my latest case, even tighting the termainsl didn't work. I had to get a jump start. Even with jump start the ...


4

I'd like to preface my answer by saying that I think the OP has asked an interesting theoretical question that deserves a theoretical/hypothetical discussion. In no way should the following be taken as an indication that removing/installing batteries carries low risk of explosion. Take precautions when working around vehicle batteries. The risk of hydrogen ...


3

Batteries give off the most hydrogen while charging or discharging so an idle disconnected battery probably isn't in danger of exploding. If you are connecting a battery to a vehicle the risk is pretty low because the battery shouldn't be producing hydrogen. If you are connecting jumpers to another vehicle's battery there is a higher risk because there could ...


3

Any ground (earth) location will work. On my '06 Silverado, there are places to hook the jumpers which are away from the battery. You don't even hook the jumpers to the battery no matter which way you're going (whether jumping or being jumped). As long as you have a good ground location, you're golden. Given two vehicles with alternative connection points ...


3

I've had this problem before a couple times. I had a failed starter solenoid one time. Another time the ground strap had broken off of the starter.


2

I can't think of any reason why you would damage the electronics in your car, unless you touched one of your jump leads somewhere you shouldn't and short something delicate or you connect the leads back to front. Connecting them back to front shouldn't damage electronics, as your car should have protection against this sort of thing, but it is the key thing ...


2

Check this answer, looks they have a remote negative near the shock mount. Check the owners manual, you may find more details on this.


2

As the comments described, you probably plugged in the block heater. Perhaps the heater warmed up the entire engine compartment over time, including the battery. Batteries deliver less current when cold, so it might have been just under the current required to turn the engine. Guess you'll find out if it starts again tomorrow!


2

No start is classified into two categories, cranking and non cranking. Cranking is when you hear the engine turning over but not starting. Where the fault would be in your ignition system. If this is the case check: - spark plugs - wires - distributor (if applicable) - Ignition coil - Starter If there is a no cranking, that means there is a fault in the ...


1

A rapid or continuous clicking noise being heard while attempting to start a vehicle is a tell-tale sign of either a very weak battery or excessive/high resistance in the starter circuit. When a main systems battery is completely exhausted you will have a rather difficult time attempting to jump start it and sometimes the battery will not take a jump or at ...


1

Yes, it is possible to damage either or both of the cars. There's a risk of serious overvoltage when jump-starting and that can damage any electronic equipment and even headlights that are on during the procedure. That's why, for example, Ford Focus C-Max manual says that all electronics and headlights should be turned off during the jump start.



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