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(Where is hydrogen concentrated when fans and engine move so much air?)
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If the fan was running we wouldn't have to jump it, would we.
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That wire (battery to frame) slows the battery discharge
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Not so. That wire is larger than most jumper cables so it's not the limiting factor.
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Also connecting a black wire to chassis makes it difficult to short two batteries negative to positive - making destruction of vehicle electronics less likely due to jumper leads reversed.
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Nope. See above or better yet weld one yourself.
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Built so that batteries tend not to explode up.
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What explodes is the hydrogen gas which above the liquid level. It blows the top off. I've witnessed it twice and seen the aftermath of many more.
The problem with clamping to the frame or even through metal bumpers is that the resistance can be to great. If the battery is marginal it may work but if the battery is way low, part of the juice is trying to charge the battery and part is trying to start the engine. The low battery provides the path of least resistance thus starving the starter.
Quite often the reason the battery is discharged in the first place is corrosion between the battery and the cable ends which prevents charging. This corrosion can also prevent jumping. I had to needlessly buy a starter to learn that one.
