When I got my runX(same-ish as Stivo), it had one but it wasn't connected, I attached it to the battery, and then something behind the dash whistled, I disconnected it, and the whistle went away... it's still in there, but only because my lazy a55 can't be bothered undoing a few bolts. and yes, a few hunks of larger gauge wire would do the same... 4ga would be huge.