ground a test light and place the tip into the signal wire (small conector) have someone hit the switch and see the test light light up...
- no light....................bad switch or starter relay
- light........................bad connection at the starter or bad starter
if the test light lit..then check for voltage at the positive cable going to the starter.
now the two round connector that u see that apparently u dont know where they go are the knock sensors conectors...see this link...
http://www.toyota-supra.info/forums/...ead.php?t=6577