Yesterday I stopped on my way home from work. When I went to start my 2000 4runner, the radio came on briefly, then everything went out. No radio, dome light, nothing.

I popped the hood open, and then heard a relay click. I want back in, turn the key, and it started right up.

Same thing happened again this morning when I went to start it to go to work.

The battery seems fine since it cranks right over when it has juice.

Whatever it is, it completely loses power since the radio presets are erased.