We're in the middle of this with our '03 Nissan Xterra. It's not supercharged. We had a mechanic do the relocation but somehow he wired it wrong. Overnight the battery would drain and the Xterra wouldn't start in the morning. We called the mechanic back out and he "re-wired" it, but the same thing happened. It would drive just fine, but when left off for an extended period of time (overnight) it would drain the battery. To be certain the relocation was/is the problem we disconnected the knock sensor completely overnight. Granted it caused a code, but it turned on the next morning with no battery drain. This issue is still open for us, since that's not what we paid for.