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Not even that - I'd suggest putting something across that board computer's DC input that gives a fast-responding, visual indication of the voltage. Say, a small bulb like you'd use on a bicycle (but rated for 12V). That way if you start the car, you can watch how its brightness responds to the changing battery voltage / diode / capacitor circuit. A LED might be less suitable for this given its current / brightness characteristics (but it would change brightness quicker than a glow bulb).It would help if you could measure the voltage at certain points and the current drawn by the load in question under different conditions - when the engine is off, when the ignition switch is on but before cranking the engine, and while cranking.
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