The headlights in the wifemobile don't come on, every so often. The parking lights (when she turns it to the middle position) come on, along with the instrument panel lights. But then when she turns the switch to the headlight position, everything goes off. Apparently this will happen, and then she can shut the car off and turn it back on and everything will be fine. Intermittent problems like that frustrate me, because of course they never happen when you've got the car in the garage so you can find out the source. What should I look at first?