[bigred90gt]

How do you have the 12v lead spliced? You are not showing any RCA's in the schematic. Dumb question, but, they are there right? Check to make sure you have a good ground, no paint, god tight connection, ect. You are also not showing a remote wire. I've never tried it, but I don't think the amp will even turn on without it.

Try unplugging the RCA'a from the amp and turning it on. If nothing, there is probably a problem in the deck itself. If that does nothing, try a different amp. If nothing, try a differend seaker. Eliminate options one at a time. Also, if I'm not mistaken, 1.6 ohms is really low. Most setups are 2ohm or 4ohm. I'd say try a different speaker.
I havea 300w amp that used to roduce a low rumble when turned on. I swapped out amps and never had another problem.

That is about the only thing I can tell you. Good luck with it.
Caymon