Those breaker things, are circuit breakers unless I'm mistaken. Should there be an over load, they break the circuit, cool, reset, and repeat! The little button to release the knob is towards the back, and on the cowl side I think. It's a little button with a spring under it. When I got my 1st truck, it perplexed me to no end, and I asked right on the board here too. If you can, stick your head under there with a good light, or use a big inspection mirror.
Hope this helps.
