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Its not getting any power the battery terminals is the only way the source of power can get to your engine to start the car. without it, theres nothing to ignite the engine. The power that is needed to start a car engine is in the form of electricity and it is mostly supplied by the cells inside the battery. The terminals are the parts of the battery that connect to the engine. So that is why they need to be hooked up. You can actually get an engine started with a dead battery if you push it and jump the clutch because it is designed to run on its own power once it gets going. In this case, you only need to connect to the terminals to complete the circuit to the alternator, which then supplies the power. When the battery is connected to the engine, the electrical power is used to turn the engine over, which means to get all its internal parts moving. Once the pistons and valves start moving, the fuel mixture is drawn into the combustion chanmbers and compressed. Once it is compressed, another electical current coming from a coil gets distributed to each of the spark plugs in sequence, which then ignites the fuel mixture in each of the cylinders, one at time. When all the cylinders are firing, the engine can run on its own and the initial battery power is no longer needed.

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βˆ™ 2007-05-27 11:03:46
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Q: Why would a car not start when you unhook the battery terminals?
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