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Concerning the main electrical system of a motor vehicle or internal combustion engine. Consider using the [electronics] tag for radios and other such systems. Use the [electric-vehicle] tag for questions about electrical powered vehicles and their unique systems.

2 votes

When should I disconnect the battery to stay safe during repairs?

When welding. Both wires are advised, and there are other concerns as well. But they'll teach you this at welding school.
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1 vote

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

I suspect it won't catch fire (batteries, regulators and alternators are quite robust) but it won't do you much good. One of your donor cars will have a less charged battery / higher terminal resista …
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