Gah. Is the solenoid "alive"? Should have 12V+ at the big lug all the time. If you hear ~nothing~ (no 'click' from solenoid) you may have a bad iggy switch, bad solenoid, or the wiring in-between. Make sure you have trigger voltage from the iggy switch (the white/red wire, IIRC) when in the start position. You may need an assistant to turn the key while you check... and don't hold it in the start position for more than a second or two, it may still be passing current and you'll melt more "stuff"! You're going to need to go thru a process of elimination. The starters are stout, so don't just throw money at it, diagnose what's wrong.