I did that originally. But in the original thread about this mod I got the impression that you could cut the tape two times at 4" per time as the tape fades or goes bad...
Was I wrong in doing so?
You can cut it, Ive done it twice. 4" at a time and you get 3 new sections every time it fades. I've always sealed it back up with a few coats of super glue and never had a problem. The black spots are mold, I had them the very first time but they have never come back since Ive cut it ??? I would just recommend not completely soaking it with water when washing.
The $10 dollar inverter failing is not that big of a surprise, not exactly high end electronics. Good thing is you caught it in time before it caused any damage under the hood. Ive never hooked a volt meter up to find out but my guess is that it takes a amp or less to power these things, having a 3 amp fuse may have blown the fuse before melting the inverter. I agree though there must be a short somewhere causing the inverter to melt.