"proper" use of jumper cables

[limey]

Originally Posted by Undertoad

cables for jumpers?

I wasn’t sure if that was a UK English word that you yanks wouldn’t understand .....


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[Gravdigr]

Why are they called jumpers, anyway? I'm talking about what we call a sweater...

[lumberjim]

cuz we want girls to jump when they wear them. mmmm... sweater puppies....

[tw]

The original jumper was a guy hiding in the bushes who jumped out when he saw the right kind of girl.

Everything is phallic in electricity. That is why connectors are male and female. And couples talk abut the right kind of electricity in their relationship.

Sometimes we want to resist her charms.

5 foot 2. Eyes of blue. Six transistors in each shoe. Has anybody seen my gal.

[BigV]

Bender on a bender is cute

[xoxoxoBruce]

Don't forget to reverse your battery cables in the spring so the A/C works instead of the heat.

[Griff]

Thanks for the reminder.

[tw]

Originally Posted by Aston

According to most manuals, connect positive terminals first then negative terminals.The battery forms hydrogen, and that's the reason why for connecting the negative to the chassie, and not to the battery negative.

That spark exists if connecting direct to a battery or indirectly via a chassis. Hydrogen has nothing to do with it.

Positive is connected first so that either + terminal does not accidentally connect to most everything else. 'Everything else' is connected to the - terminal. Firmly attaching those red clamps before making any other connection makes an accidental short less likely.

Connecting to a chassis - not battery - is so that an accidental short circuit is less likely to cause a battery explosion. An explosion not due to ignited hydrogen. A battery that is shorted can get so internally hot as to explode.

Why do I know? We learn this stuff from experience (mistakes).

[xoxoxoBruce]

During the final stages of charging, all lead-acid batteries break down some of the electrolyte in a battery into hydrogen and oxygen. With sealed batteries, such as gel cells and AGMs, the gases are normally contained within the battery, although in certain circumstances (notably, persistent overcharging), enough internal pressure can build up to open pressure release valves and vent the gasses. With wet cell batteries – the type that need topping up from time to time – the gases are always vented.

Hydrogen, which is highly explosive, is much lighter than air, so typically will rapidly rise and disperse, so long as there is even minimal venting from the top of a battery box and from the top of the compartment in which the battery box is housed. However, if a pocket of gas forms, any spark (such as from a brushed electric motor kicking on) may set off the hydrogen, on occasion resulting in a powerful explosion. This is what blew the top off the Fukushima nuclear power plants in Japan. Occasionally, internal short circuits create a spark inside batteries that can set off a hydrogen explosion within the battery, blowing the case open. Note that this can occur with sealed batteries as well as with wet cell batteries.


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