Quote:
Originally Posted by speeder
... Car is a 2009 Suzuki and owner is going through a tough time so trying to help if possible without just throwing parts at it or putting it in a shop. TIA.
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Hi Denis! I hope all is well with you.
The following is a real-world example of an engine starting.
There is an initial, large draw of current from the battery (often in hundreds of amps) to begin the rotation of the engine. In conjunction, the battery voltage will drop significantly, as you noticed. After the initial rotational inertia is generated, the amperage draw drops off but current draw is still significant (heating of the starter!). The pulses in the current plot show the compression of the cylinders as the engine rotates. The engine begins to start, current load drops and the battery begins recovery; the engine then runs.
Many factors effect the starting of the engine. Health of the starter, battery, engine, (cold) temperature, type of oil, etc. I'm sure many people can offer a better and more detailed explanation, but this is the very basics.
Lee