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Thus says an electrician (me)...
Voltage stabilizer = snake oil.
A capacitor is only effective at stabilizing voltages in AC (alternating current - such as in your home)... not DC (such as in your car). In an AC system, it helps to eliminate ripple current, and straighten out the waveform of the AC pulse.
However, this isn't the case in a DC system. A capacitor in a DC circuit acts as a voltage blocker. When DC power is applied to one side of the capacitor, it stores a charge on one of the plates... where it stays indefinitely until it is discharged. What does all this mean? A voltage stabilizer is useless.
If one REALLY wanted to stabilize the voltage in a DC system, a 1:1 transformer would help somewhat... but the effects would likely be minimal.
If you really want to see if a positive change has taken place with a 'voltage stabilizer' - show me an oscilloscope waveform of before and after installing the stabilizer. What you'll find is there is ZERO change.
Can we please drop this subject of voltage stabilizers and assign it to the halls of urban legends?
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