Check to make sure that its in neutral. Then check it again. The put the parking brake on and block the tires. Lay down in front of the back left tire and you should be able to see the starter. Jump the bolt terminal to the spade connector (bolt is power from batter, spade is signal wire from switch). It should spin over. If it does, then there is a problem with the signal wire. I usually use a 14mm wrench cause its about that far apart (and I don't use the 14 much!).
That wire comes across under the backseat of a beetle and you can access an in-line connector to "jump" the signal wire off the battery. I guess its fair to ask if you are certain you are getting 12 volts to the switch? 12 volts to the coil?
Make sure its in neutral before you lay down in front of the tire and jump the starter!
