i'm just posting this here since there seems to be a decent amount of people with electrical knowledge, and also it may be relevant to people here...

well, i'm sure a lot of you have seen these "voltage stabilizers" on ebay and what not. they are very cheap and most come from Hong Kong from a multitude of vendors with unclear credentials...

as shady as these may sound, and what i originally thought of them, upon closer inspection they may actually have some merit.

really the term they use, ''voltage stabilizer'', is just something that is generic that is given by the salesman with no electrical knowledge.

it seems all these things consist of are a bunch of capacitors. the way they say to install these, it would effectively be in parallel with the rest of the cars components. two possible advantages (from a theory perspective):

1) due to the nature that voltage across a capacitor can NOT change instantaneously, then yes technically it will keep the voltage that each component in the circuit sees ''stable'' since v1=v2=...=v for components in parallel.

2) another matter i have thought about is electrical noise (RF interference). i don't really know too much about this, but capacitors can be used in a circuit to actually reduce electrical noise. it mentions it briefly here:
http://en.wikipedia.org/wiki/Electrical_noise


HOWEVER, i am still skeptical about these since they seem to be heavily marketed from these ebay and low-grade discount retailers...some testing would have to be done to really see what they do and make sure there are no negative effects...