I have enough electrical/electronics knowledge to know that they don't make a bit of difference (save for $placebo$ effect) until you're talking about huge levels of current (or wire that has mostly failed due to corrosion)...which except for the starter (when in use), you won't ever hit that high of a level of current.
A set of huge filter caps between your alternator and your cars electronics would do more for making your electronics happy....and even those are designed to operate well within the levels of output your alternator can produce...
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