Originally Posted by pmckechnie

If the dome light and clock go off when you turn the key to start, then you probably don't have an ign switch problem. They don't get their power through the switch. I would guess a bad connection at the battery, battery to chassis ground problem, battery to fuse block open, or something like that. A simple 12V test light is the best test equipment for a problem like this. Use a test light with an actual bulb, not a LED. You can use a DVM here also, but a test light is actually better in this case.
Using the test light, make sure you have ground where you should have ground and power where you should have power. Keep an eye on the dome light because if it comes back on, then the problem has gone away as far as testing goes.

Paul