I forgot that you'll need to find ground before you can test the contacts with the test lead. You should be able to tell whats what by checking the wires colors. I believe ground in a car is black, I'm not sure though. Its green in my field. Just put the relay back in and take note of what wire...
we've tested seceral RF amps at school and they usually come no where close to their power ratings. The older RF's do a little more than rated though. You mentioned audiobahn being crap: is this just their amps or did you mean their subs too? I have 2 Natural Sound subs and I've been very happy...