[craign]

driver,

Your symptoms sound exactly what I experienced a few months ago and it did turn out to be the ignition switch. I did not know that 66's had a steering lock..

On my 69 I was able to get the switch apart and inside I found the contact for the starter with a nice hole burned through it. Getting the switch apart was easy, just a small clip ring on the back that was easy to pop off with 2 small screwdrivers, watch it though that clip can fly quite distance when it pops off.

I bought a switch with no key from Parts Heaven and just swapped internal guts and was able to keep the tumbler and original key.

I don't know if this helps at all with the lock type switch but that is where I would look. One quick test I did to confirm the switch was to put a light tester on the yellow wire and ground then turn the key to see if you are getting power via the ignition switch. I have heard from several other 912 owners that the "hot start" relay is a good thing to do on these as it relieves some of the electrical stress off of the switch and removes the notorious hot start problems.

Craig