Bud. Please put in the model of your rv but I will assume it a 28z. I have a 28z as well. The switch is for side view mirror heaters. As far as the dinette Are use both for storage. I put piano hinges on them as well. The emergency start switch is used when your chassis battery is dead. You push the switch and hold it and start your vehicle. It uses the house batteries. I do not have an answer for your last two questions
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