Well, I did get my install done that weekend and it works great with both the Alpine HU and empeg running off the car's wiring harness.

One issue with this particular car (1998 Isuzu Trooper) is that it has two antenna connections. One is standard and the other looks like a GM-type. It doesn't seem like one is a power lead, but the radio reception is crap with only one or the other connected. This isn't really bothering me since I have XM on the Alpine and that kicks the crap out of NY terrestrial radio. I guess I should ask Crutchfield about this, but this truck isn't exacly a normal model for the year. Instead of the standard antenna next to the hood, it has two glass antennas on the rear side windows. I would assume they're powered, but I don't see a lead for that.

Anyway, pics are coming, but it's always too dark out when I have time now.